Document:

<PAGE>

                                                                  Exhibit 10.7.4

                               AGREEMENT, Phase 4

This Agreement is entered into effective as of the 1st day of October, 2006, by
and between GT Solar Incorporated, located at 243 Daniel Webster Highway,
Merrimack, NH 03054 USA ("GT Solar" or "GT") and Jiangxi LDK Solar Hi-Tech Co.,
Ltd. at Xinyu Hi-Tech Development Zone, Xinyu City, Jiangxi, China ("Customer").

WHEREAS, Customer wishes to buy and GT Solar wishes to sell certain solar wafer
fabrication equipment and/or technologies more particularly defined herein below
and in the attached EXHIBITS A and B ("Equipment") and;

WHEREAS, Customer wishes to install the Equipment in Xinyu, Jiangxi, China;

WHEREAS, the parties wish to enter into this Agreement to more particularly
define the terms and conditions of the purchase and sale of such Equipment.

NOW, THEREFORE, for good and valuable considerations the parties agree as
follows:

1. EQUIPMENT. GT Solar shall sell and Customer shall purchase one hundred (100)
GT-DSS450 furnaces, more particularly described in EXHIBITS A and B attached
hereto and incorporated herein by reference. GT Solar warrants and represents
that, upon Shipment to Customer pursuant to Article 4, title to the Equipment
will be free and clear and without any liens or encumbrances except as provided
in Article 9 of this Agreement.

2. PURCHASE PRICE; PAYMENT TERMS. The purchase price for the Equipment and
related services ("Purchase Price") shall be Sixty Four Million Three Hundred
Fifty Thousand U.S. Dollars ($64,350,000 USD).

2.1. Customer shall pay a deposit ("Deposit") equal to twenty percent (20%) of
the total Purchase Price by wire transfer to GT Solar's bank account in six (6)
monthly installments of Two Million One Hundred Forty-five Thousand
(US$2,145,000) US Dollars each beginning November 15, 2006
and ending April 15, 2007 as more fully set forth in Exhibit C.

2.2. Fourteen (14) days before each Deposit installment payment, GT Solar will
open a standby letter of credit in the amount of such Deposit installment in
favor of Customer against GT Solar's failure to deliver the Equipment pursuant
to the terms of this Agreement.

2.3. In accordance with the schedule set forth in Exhibit C, Customer will
establish in favor of GT Solar irrevocable letters of credit equal to seventy
percent (70%) of the Purchase Price allocable to each Shipment, which letters
of credit shall specify that they are payable to GT upon GT's presentation of
shipping documents.

2.4. Ten percent (10%) of the Purchase Price allocable to a given Shipment will
be paid by Customer to GT Solar by wire transfer within 30 days after the date
of Acceptance of the items of Equipment included with such Shipment, but not
later than 90 days after Shipment.

3. COMMENCEMENT DATE. The "Commencement Date" will be the date GT Solar receives
the initial Deposit installment payment.

4. SHIPMENT AND SHIPMENT TERMS. Shipments shall be made pursuant to the schedule
set forth in Exhibit D. Transfer of title and risk of loss for each item of
Equipment shall occur upon each such delivery of such Equipment to Customer ex
works (Incoterms 2000) Woburn, Massachusetts ("Shipment").

                                     Page 1

<PAGE>

5. CONTRACT SERVICES. Within sixty (60) days of the Commencement Date, GT Solar
shall provide Customer a list of facilities and any other requirements such as
power, water and space for installation and operation of the Equipment. GT Solar
shall also, as part of the Purchase Price, provide supervision for the
unpacking, installation, start up and acceptance of the Equipment. Customer
shall provide all local labor and support for commissioning and start up of the
Equipment.

Customer shall pay the cost of all the room, board and local transportation of
GT Solar's representatives during the period of the performance of such
services.

6. CONTRACT TERM. The Term of this Agreement shall commence upon the execution
and delivery of this Agreement and shall terminate upon the acceptance of the
Equipment by Customer as set forth in Exhibit B ("Acceptance"). The warranty,
indemnification and non-solicitation provisions set forth in Articles 9, 10, 15
and 30 shall survive acceptance of the equipment.

7. EQUIPMENT INSPECTION. Customer shall not be entitled to inspect Equipment
prior to Shipment.

8. CUSTOMER RESPONSIBILITIES. It will be Customer's responsibility to provide
the facilities and prepare the production site for installation of the Equipment
one (1) month prior to each shipment. Facilities preparation shall include, but
is not limited to, the provision for appropriate electrical power, compressed
air, cooling water circulation systems, gas circulation systems, exhaust,
back-up cooling water systems, back-up power systems, and such other
specifications as GT shall provide (including pursuant to Article 5), all
subject to compliance with applicable law. Any delays on the part of Customer in
preparation of the building, facilities or personnel shall not affect the
obligations of Customer to pay for items of Equipment that GT makes
available for Shipment as set forth in this Agreement. Additionally, GT may in
its sole discretion extend the performance of any of its obligations under this
Agreement by an amount of time equal to any such delay by Customer in the
scheduled preparation of Customer's building, facilities and/or personnel.

                                     Page 2

<PAGE>

Customer will also be solely responsible for furnishing the personnel necessary
for the proper installation of the Equipment at the Customer site, operational
training during start up and other recommended periods, and acceptance of the
Equipment. A list of certain Customer supplied items is attached as EXHIBIT E.

9. SECURITY INTEREST. GT Solar reserves, and Customer hereby grants GT Solar, a
continuing security interest in Equipment, together with all additions,
improvements and accessories thereto made or supplied by GT Solar at any time,
and all proceeds of the foregoing, to secure payment of the Purchase Price to GT
Solar. Until receipt of final payment, Customer agrees that GT Solar shall have
the right to file or record a financing statement pursuant to applicable law to
evidence GT Solar's security interest in the Equipment and Customer will execute
such financing statements and other documents as GT Solar shall request to
perfect such interest. Customer agrees that, in the event of its failure to make
any payment required pursuant to this Agreement, it will make all Equipment
available to GT Solar upon demand and will pay all reasonable costs of GT Solar
in connection with the collection of any amounts due or other enforcement of GT
Solar's rights.

10. WARRANTY. For the earlier of (i) 15 months from the date of shipment to
Customer or (ii) one year from Acceptance of each item of Equipment, GT Solar
warrants that all electrical and mechanical parts shall be free from defects in
workmanship and materials and shall conform to GT Solar's specifications as set
forth in Exhibit B. If any such parts are defective during the warranty period
or, upon shipment the item of Equipment fails to meet the specifications set
forth in this Agreement, Customer shall inform GT Solar and GT Solar shall
either repair or replace any such items determined by GT Solar to be defective.
GT Solar's liability shall be limited to the cost of repairing and replacing
such defective items when shipped to GT Solar, freight prepaid, by Customer. The
repaired or replaced parts shall be shipped to Customer by GT Solar freight
prepaid.

THE FOREGOING WARRANTY SPECIFICALLY EXCLUDES THE RESULTS OF NORMAL WEAR AND TEAR
AND ANY COSTS ASSOCIATED WITH CUSTOMER'S LABOR, EQUIPMENT DOWNTIME, PUNITIVE,
INCIDENTAL OR CONSEQUENTIAL DAMAGES, ACTS OF GOD, OR LOSS OF PRODUCTION. A
PURCHASE ORDER FROM THE CUSTOMER IS REQUIRED TO INITIATE ANY WARRANTY ACTION
PENDING APPROVAL BY GT SOLAR OF THE CLAIM.

In the event that Customer has purchased Equipment from GT Solar that has been
manufactured by another manufacturer, GT Solar hereby agrees to pass through, to
the extent practical to do so, to Customer any and all longer warranties made by
such manufacturer.

This warranty does not extend to any items of Equipment that fails to meet the
above warranty terms due to any uses other than for the purpose for which it is
designed and supplied by GT Solar, or by reason of improper installation or
operation by Customer or that has been subject to misuse, neglect or accident or
that has been repaired or materially altered other than by GT Solar.

     THE WARRANTY SET FORTH HEREIN IS THE EXCLUSIVE WARRANTY AND IS IN LIEU OF
     ALL OTHER WARRANTIES, WHETHER STATUTORY, EXPRESS OR IMPLIED, INCLUDING THE
     WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND ALL
     WARRANTIES ARISING FROM COURSE OF DEALING OR USAGE. THE REMEDIES PROVIDED
     HEREIN

                                     Page 3

<PAGE>

     ARE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES WHETHER THE CLAIMS BY CUSTOMER
     ARE BASED IN CONTRACT, IN TORT (INCLUDING NEGLIGENCE) OR OTHERWISE.

11. INTELLECTUAL PROPERTY INDEMNIFICATION. GT Solar shall indemnify and hold
harmless Customer against any claim by any third party that the Equipment, when
used for the purpose for which it is designed and pursuant to GT Solar's
specifications, violates or infringes the patent, copyright, trademark, trade
secret or other proprietary rights of such third party. Indemnification
pursuant to this Article 11 shall be subject to the procedures set forth in
Article 16.

Notwithstanding the foregoing, GT Solar shall have no obligation with respect to
claims of infringement based upon the use of the Equipment, individually or in
combination with other equipment supplied by GT Solar or others, if the
Equipment is used for any process other than that for which it was designed and
supplied by GT Solar. Further, GT Solar shall have no obligation with respect to
claims of infringement in the event that the Equipment is manufactured or
designed or operated in accordance with a design, drawings or process not
furnished by GT Solar.

In the event of infringement or suspected infringement of any third party's
proprietary rights based upon the use of the Equipment, GT may, at its cost,
undertake requisite steps to avoid infringement of such third party's
proprietary rights (including, for example, obtaining a license from the
relevant party and/or modifying the Equipment or replacing it with
non-infringing equipment).

The foregoing states the entire liability of GT Solar for any loss, liability,
or damage whatsoever to or sustained by Customer arising out of the infringement
by the Equipment of the proprietary rights of third parties.

12. CUSTOMER TERMINATION. Customer may terminate this Agreement (other than for
default pursuant to Article 13 below) at any time by providing written notice of
such termination to GT Solar at least thirty (30) days in advance of the
proposed termination date. If Customer terminates this Agreement or any portion
hereof within thirty (30) days following the Commencement Date, GT Solar shall
retain all payments due or received up to the date of the proposed termination.
In the event that Customer terminates this Agreement between thirty-one (31) and
sixty (60) days after the Commencement Date, Customer shall pay to GT Solar
sixty percent (60%) of the Purchase Price. If the Agreement is terminated by
Customer at any time after sixty-one (61) days following the Commencement Date,
Customer shall pay to GT Solar the entire amount of the Purchase Price.

13. DEFAULT.

A. Either party may terminate this Agreement upon written notice to the other
party upon the failure of the other party to perform any material term,
condition or covenant of this Agreement, which failure has not been corrected
within thirty (30) days of the date of written notice of such failure given by
the other party. GT may terminate this Agreement upon written notice to Customer
upon the failure of Customer to make a payment when due. In the event that one
of the parties becomes insolvent or the subject of any bankruptcy proceeding
that is not dissolved within sixty (60) days, the other party may terminate this
Agreement upon written notice to the party that is insolvent or subject to the
bankruptcy proceeding.

                                     Page 4

<PAGE>

B. In the event of termination of this Agreement by GT Solar pursuant to the
terms of this Article 13, in addition to any other remedies it may have at law
or in equity, GT Solar may recover any and all monies which may be due pursuant
to Article 2 or any other provision of this Agreement and repossess any items of
Equipment sold hereunder for which it has not been paid in full. In the event of
termination by Customer pursuant to the terms of this Article 13, Customer shall
have the right to terminate the order and recover any monies previously paid by
it to GT Solar for items of Equipment that have not been shipped to Customer.

14. FORCE MAJEURE. GT Solar and Customer shall not be held responsible for any
delay or failure hereunder caused by fires, strikes, embargoes, government
requirements, civil or military authorities, acts of God or of the public enemy
or, if not within their reasonable control, by acts or omissions of
subcontractors, failure of transport, failure of communications, failure of
power supply or any other causes beyond their reasonable control, provided,
however, that this Article 14 shall not relieve a party of its obligation to
pay hereunder.

15. LIMITATION OF LIABILITY. UNDER NO CIRCUMSTANCES WILL GT SOLAR BE LIABLE TO
CUSTOMER, WHETHER IN CONTRACT, IN TORT (INCLUDING NEGLIGENCE), UNDER ANY
WARRANTY OR OTHERWISE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, CONSEQUENTIAL OR
PUNITIVE LOSS OR DAMAGE, OR LOSS OF PROFITS OR REVENUES, RESULTING FROM
OR ARISING OUT OF OR IN CONNECTION WITH GT SOLAR'S PERFORMANCE UNDER, OR BREACH
OF, THIS AGREEMENT OR THE MANUFACTURE, SALE, DELIVERY, RESALE, REPAIR OR USE OF
ANY ITEMS OF EQUIPMENT COVERED BY OR FURNISHED PURSUANT TO THIS AGREEMENT. THE
REMEDIES EXPRESSLY PROVIDED HEREIN ARE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES,
WHETHER CLAIMS ARE BASED IN CONTRACT, TORT (INCLUDING NEGLIGENCE OR STRICT
LIABILITY) OR OTHERWISE. TO THE EXTENT PERMITTED BY LAW, IN NO EVENT SHALL GT'S
LIABILITY IN CONNECTION WITH THIS AGREEMENT EXCEED THE PURCHASE PRICE PAID BY
CUSTOMER FOR THE EQUIPMENT. NOTHING IN THIS AGREEMENT SHALL LIMIT OR EXCLUDE
THE LIABILITY OF EITHER PARTY FOR DEATH OR PERSONAL INJURY RESULTING FROM ITS
NEGLIGENCE OR FOR FRAUDULENT MISREPRESENTATION.

16. INDEMNIFICATION. Each party agrees to defend, indemnify and hold harmless
the other party from and against any third party claims arising out of the
negligence or willful misconduct of the indemnifying party or any material
breach by the indemnifying party of any of its obligations under this Agreement.
Each party's duty to defend and indemnify the other is conditional upon timely
notice by the other party of any claim for which indemnification is sought and
control by the indemnifying party of the litigation or settlement of any
indemnified claim.

17. LICENSED PROGRAMS. Computer software or other technology or know-how that,
in GT Solar's judgment, are required for the operation of the Equipment shall be
provided by GT Solar to Customer subject to such license terms as GT Solar shall
reasonably require.

In the event Customer sells, transfers or otherwise assigns its rights or
interests in the Equipment to any third party, except a parent or subsidiary
company of Customer, it is expressly understood that Customer does not have the
right to transfer licensed programs or assign the license or any rights Customer
may have regarding the use or possession of such licensed programs to such third
party without GT Solar's prior written consent and any attempted transfer or
assignment shall be void and of no force and effect.

18. GOVERNING LAW. This Agreement and any related order shall be governed and
interpreted, construed, and enforced in accordance with the laws of England,
notwithstanding the choice of law rules of any jurisdiction, and the Convention
for the International Sale of Goods to the contrary notwithstanding, which
Convention shall not apply and which is hereby expressly disclaimed.

                                     Page 5

<PAGE>
19. ASSIGNMENT. Neither party shall delegate any duties or assign any rights or
claims under this Agreement, other than to a parent or subsidiary company, and
in the case of Customer, to a parent or subsidiary located in the PRC, without
the other party's prior written consent, which consent shall not be unreasonably
withheld, and any such attempt at delegation or assignment shall be void.

20. FURTHER ASSURANCES. At any time, and from time to time after the
Commencement Date, each party will execute such additional instruments and take
such additional actions as may be reasonably requested by the other party to
confirm or perfect title to any property transferred hereunder or otherwise to
carry out the intent and purposes of this Agreement.

21. WAIVER. Any failure on the part of any party hereto to comply with any of
its obligations, agreements or conditions hereunder may only be waived in
writing by the party to whom such compliance is owed.

22. ARBITRATION. Any disputes that cannot be amicably resolved by the parties
shall be submitted to binding arbitration for resolution. The arbitration shall
be conducted before a panel of three (3) arbitrators in New Hampshire under the
rules of the American Arbitration Association. Each party shall select one
arbitrator and the two so chosen shall select the third, who shall act as
chairperson. If a party shall fail to appoint an arbitrator within twenty (20)
days after receiving written notice of the arbitration and the name of the
arbitrator selected by the party initiating the arbitration, the initiating
party may request that the American Arbitration Association appoint the second
arbitrator, and if the two arbitrators so selected fail to select a third
arbitrator within twenty (20) days after the appointment of the second
arbitrator, either arbitrator may request that the American Arbitration
Association select the third arbitrator. The decision of the majority of the
arbitrators shall be final and binding on the parties with respect to all
matters referred to the arbitration panel for decision and may be enforced in an
appropriate court in any competent jurisdiction. The arbitrators shall not have
the authority to award punitive or special damages. In the absence of a contrary
ruling by the arbitrators, each party shall pay its own costs and fees in
connection with the arbitration.

23. NOTICES. All notices and other communications hereunder shall be in writing
and shall be deemed to have been given if (i) delivered in person, (ii) sent by
prepaid first class registered or certified mail, return receipt requested, or
(iii) by delivery to the other party by recognized courier to the following
addresses:

To GT Solar:               GT Solar Incorporated
                           243 Daniel Webster Highway
                           Merrimack, NH 03054 USA
                           Attn: President
                           cc: General Counsel
                           Tel: (603) 883-5200
                           Fax: (603) 598-0444

                                     Page 6

<PAGE>
To Customer:               Jiangxi LDK Solar Hi-Tech Co., Ltd.
                           Xinyu Hi-Tech Development Zone,
                           Xinyu City, Jiangxi, China
                           Attn: ____________________
                           Tel : + __________________
                           Fax : + __________________

24. EXPENSES. Whether or not the transactions contemplated hereby are
consummated, all costs and expenses incurred in connection with this Agreement
and the transactions contemplated shall be paid by the party incurring such
costs and expenses.

25. HEADINGS. The section and subsection headings in this Agreement are inserted
for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

26. COUNTERPARTS. This Agreement may be executed simultaneously in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

27. BINDING EFFECT. This Agreement shall be binding upon the parties hereto and
inure to the benefit of the parties, their successors and permitted assigns.

28. ENTIRE AGREEMENT. This Agreement is the entire agreement of the parties with
respect to the subject matter hereof. There are no oral or written promises,
conditions, representations, understandings, interpretations or terms of any
kind as conditions or inducements to the execution hereof. This Agreement
supersedes all prior agreements, written or oral, including any memorandum of
understanding between the parties.

29. SEVERABILITY. If any part of this Agreement is deemed to be unenforceable,
the balance of this Agreement shall remain in full force and effect.

30. CONFIDENTIALITY AND NON-SOLICITATION. Except as expressly authorized herein,
neither party will, directly or indirectly, disclose or use for its own purposes
any proprietary confidential information of the other party ("Confidential
Information"), except that such prohibition shall not apply to information that
is or becomes publicly available other than by breach by a party of its
obligations hereunder. In no event shall the party receiving Confidential
Information reverse engineer, decompile or otherwise attempt to discover or
reproduce any technology or other intellectual property or trade secrets
included in the Confidential Information supplied by the other party.

During the term of this Agreement and for a period of three (3) years
thereafter, neither party will hire, directly or indirectly, any employee,
officer, contractor or consultant of the other party.

31. NO THIRD PARTY BENEFICIARIES. Nothing in this Agreement will give rights to
any third parties and the provisions of the Contract (Third Party Rights) Act
are specifically excluded.

<PAGE>
IN WITNESS WHEREOF, the parties have caused this Agreement to be executed on
their behalf by their duly authorized agents as of the day and year first above
written.

Executed as of the date first written above.

For:  Jiangxi LDK Solar Hi-Tech Co., Ltd.       For:  GT Solar Incorporated
      Xinyu Hi-Tech Development Zone                  243 Daniel Webster Highway
      Xinyu City, Jiangxi, China                      Merrimack, NH 03054 USA

/s/ Xiaofeng Peng                               /s/ Thomas M. Zarrella
-----------------------------                   --------------------------
Light DK Peng                                   Thomas M. Zarrella 10/10/06

                                                /s/ Kedar P. Gupta
                                                --------------------------
                                                Kedar P. Gupta 10/10/06

                                                /s/ Howard Smith
                                                --------------------------
                                                Howard Smith 10/10/06

                                     Page 8

<PAGE>

                                   EXHIBIT A

                                   EQUIPMENT

<Table>
<Caption>
----------------------------------------------------------------------------------------------------
                   EQUIPMENT (units)                        Unit Price                Total
----------------------------------------------------------------------------------------------------
<S>                                                         <C>                  <C>
GT-DSS 450 furnace (100)                                        $[*]              $64,350,000
(exclude mezzanines)
----------------------------------------------------------------------------------------------------
</Table>

* Confidential Treatment Requested. The redacted material has been separately
  filed with the Securities and Exchange Commission.

                                     Page 9

<PAGE>

                                   EXHIBIT B
                                   ---------

                            EQUIPMENT SPECIFICATIONS
                                      AND
                   ACCEPTANCE TESTING PROCEDURES AND CRITERIA

                               GT-DSS450 FURNACES

     I.   EQUIPMENT SPECIFICATIONS:
          -------------------------

Ingot Size:         nominal 846 x 846 mm
Ingot Weight:       375 kg to 450 kg
(The ingot weight above requires the feedstock material to have a size
distribution to allow sufficient packing density to fit into the crucible.)

Ingot Conductivity type:           p-type (boron)
Ingot Crystal Characteristic:      multi-crystalline
Ingot Resistivity:                 0.5 - 2.0 ohm-cm
                                   (Typical average: 1.5 ohm-cm)

DSS Cycle Time:          < or = 60 hours (start to start)

     II.  ACCEPTANCE TESTING PROCEDURES AND CRITERIA
          ------------------------------------------

Within Thirty (30) days following installation of an item of Equipment at the
Customer's facility, but not later than Ninety (90) days following Shipment of
that item of Equipment to Customer, Customer will conduct the testing of such
item of Equipment (which testing will be supervised by GT) to confirm that such
item of Equipment meets the following acceptance criteria. The test shall be
conducted using virgin solar grade silicon as the feedstock material and a
Vesuvius crucible. The Customer will provide the argon gas, silicon feedstock,
crucibles, dopant and crucible coating materials for the tests along with all
other utilites and facilities normally required for operation of the Equipment.

Ingot Size:         nominal 846 x 846 mm
Ingot Weight:       375 kg to 450 kg
(The ingot weight above requires the feedstock material to have a size
distribution to allow sufficient packing density to fit into the crucible.)

Ingot Conductivity type:           p-type (boron)
Ingot Crystal Characteristic:      multi-crystalline
Ingot Resistivity:                 0.5 - 2.0 ohm-cm
                                   (Typical average: 1.5 ohm-cm)

DSS Cycle Time:     < or = 60 hours (start to start)
DSS Testing:        grow 3 ingots per furnace with no visible cracks

Confidential                        Page 11                       Sept. 21, 2006
<PAGE>
Upon confirmation that the acceptance criteria set forth above have been
achieved, the Customer will execute and deliver to GT and Equipment Acceptance
Certificate in the form attached as Exhibit B, page 2.

The Customer must provide the necessary facilities, materials and utilities for
the acceptance testing of each item of Equipment. If, for reasons not wholly
attributable to GT, acceptance testing is not completed by the earlier of
Thirty (30) days following the installation of an item of Equipment or Ninety
90) days following Shipment of that item of Equipment, then the acceptance
criteria will be deemed to have been met and the Customer shall execute and
deliver to GT the Equipment Acceptance Certificate in the form attached as
Exhibit B, page 2.

Confidential                        Page 12                       Sept. 21, 2006
<PAGE>
                               EXHIBIT B (PAGE 2)
                               ------------------

                        Equipment Acceptance Certificate
                        --------------------------------

Customer:
--------------------------------------------------------------------------------

Contract No.:
--------------------------------------------------------------------------------

Sales Order No.:
--------------------------------------------------------------------------------

Machine Type:
--------------------------------------------------------------------------------

Machine Model:
--------------------------------------------------------------------------------

Serial No.:
--------------------------------------------------------------------------------

Service Engineer/GT Solar Representative:
--------------------------------------------------------------------------------

     This certifies that the item of Equipment referenced above has been
     tested by the Customer and meets all applicable acceptance criteria.

             Print Name:
                        ---------------------------------------------
     Customer Signature:
                        ---------------------------------------------

                      DATE:
                           -------------------------

Confidential                        Page 13                       Sept. 21, 2006
<PAGE>

                                    EXHIBIT C

                                Payment Schedule

<Table>
<Caption>
                  Deposit Installment Payment Schedule
-----------------------------------------------------------------------
Payment #                 Amount (US-$)                   Date Due
---------                 -------------               -----------------
<S>                       <C>                         <C>
    1                      $2,145,000                 November 15, 2006
    2                      $2,145,000                 December 15 2006
    3                      $2,145,000                 January 15, 2007
    4                      $2,145,000                 February 15, 2007
    5                      $2,145,000                 March 15, 2007
    6                      $2,145,000                 April 15, 2007
</Table>

<Table>
<Caption>
                      Letter of Credit Schedule
-----------------------------------------------------------------------
  L/C #                   Amount (US-$)                    Date Due
---------                 -------------               ------------------
<S>                       <C>                         <C>
    1                      $4,504,500                 March 15, 2007
    2                      $4,504,500                 April 15, 2007
    3                      $4,504,500                 May 15, 2007
    4                      $4,504,500                 June 15, 2007
    5                      $4,504,500                 July 15, 2007
    6                      $4,504,500                 August 15, 2007
    7                      $4,504,500                 September 15, 2007
    8                      $4,504,500                 October 15, 2007
    9                      $4,504,500                 November 15, 2007
   10                      $4,504,500                 December 15, 2007
</Table>

                                    Page 14

<PAGE>

                                    EXHIBIT D

                               SHIPMENT SCHEDULE

<Table>
<Caption>
                  UNITS                             SHIPMENT DATE
                  -----                             -------------------
                  <S>                               <C>
                   10                                May 31, 2007
                   10                                June 30, 2007
                   10                                July 31, 2007
                   10                                August 31, 2007
                   10                                September 30, 2007
                   10                                October 31, 2007
                   10                                November 30, 2007
                   10                                December 31, 2007
                   10                                January 31, 2008
                   10                                February 28, 2008
</Table>

                                    Page 12

<PAGE>

                                   EXHIBIT E

                        CERTAIN CUSTOMER SUPPLIED ITEMS

1.   Necessary water chillers with back-up systems

2.   Necessary water with back-up systems

3.   Clean, dry compressed air

4.   All plumbing and wiring to the machines

5.   Necessary power with back-up systems

6.   Materials handling equipment

7.   Shelves, storage cabinets, and workbenches

8.   Other engineering and facility services needed-to be defined by GT Solar
     within 60 days of the Commencement Date.<PAGE>

                                                                    Exhibit 10.8

                              PURCHASING AGREEMENT

                                                           Date: January 5, 2007

THE BUYERS:     JIANGXI LDK SOLAR HI-TECH CO., LTD.
Address         Xinyu High Tech Development Zone, Xinyu, Jiangxi Province, China
                Tel: 86-512 6562 9698  Fax: 86-512 6562 2785  Post Code: 338032

THE SELLERS:    HCT SHAPING SYSTEMS SA
Address         Route de Geneve 42, CH-1033 Cheseaux, Switzerland
                Tel: +41-21-731 9100  Fax: +41-21-731 9101

This Purchasing Agreement is made by and between the buyers and the Sellers for
the purchase of HCT equipment under following terms and conditions:

1.   The Buyers will place order to the Sellers for a total order of no less
     than 170 units of HCT wire saw model E500SD-B/5 and no less than 65 units
     of HCT wire saw model SQUARER.

2.   The order and delivery shall be completed before December 31, 2008.

3.   The unit price for HCT wire saw model E500SD-B/5 is USD825,000.00. The
     price for HCT wire saw model SQUARER is USD730,000.00. The Sellers agree to
     keep these prices and valid for the delivery until December 31, 2008.
     However, the Sellers has the right to adjust the prices if the USD-CHF
     currency fluctuation is more than 5% of the current prevailing exchange
     rate at 1.31.

4.   Payment terms: 15% advance payment paid by T/T to the Sellers' account in
     Switzerland within 10 days after the aforesaid Contract is signed by both
     parties. 75% of contract value shall be paid by an irrevocable L/C 30 days
     before the shipment, 10% balance payment shall be effected by T/T within 10
     days after the machine is installed and accepted.

5.   A separate contract shall be established for each delivery from the
     Sellers. This contract is used for the executions of payments, customs
     declarations and the machine commissioning. Both parties have discussed and
     mutually agreed to terms and conditions of the contract as appeared in the
     appendix of this Agreement.

The Buyers                                 The Sellers
JIANGXI LDK SOLAR HI-TECH CO., LTD.        HCT SHAPING SYSTEMS SA

 /s/ Xiaofeng Peng                          /s/ Stefan Schneeberger
---------------------------------------    ------------------------------------

<PAGE>
                                    CONTRACT

                                                  No.
                                                     ---------------------------
                                                Date:
                                                     ---------------------------

<TABLE>
<S>                     <C>                            <C>                         <C>
THE BUYERS:             JIANGXI LDK SOLAR HI-TECH CO., LTD.
Address:                Xinyu High Tech Development Zone, Xinyu, Jiangxi Province, China
                        Tel: +86-512 6562 9698         Fax: +86-512 65622785       Post Code: 338032

THE SELLERS:            HCT SHAPING SYSTEMS SA
Address:                Route de Geneve 42, CH-1033 Cheseaux, Switzerland
                        Tel: +41-21-731 9100           Fax: +41-21-731 9101
</Table>

This Contract is made by and between the buyers and the Sellers whereby the
Buyers agree to buy and the Sellers agree to sell the goods according to the
terms and conditions stipulated hereunder:

1.
<Table>
<Caption>
-----------------------------------------------------------------------------------------------------------------------------------
 Item                           Goods Specifications                            Unit      Qty       Unit Price      Total Amount
                                                                                                      (USD)             (USD)
-------  -------------------------------------------------------------------   -------  --------  --------------  -----------------
<S>      <C>                                                                   <C>      <C>       <C>             <C>
1.      HCT Wire Saw Model E500SD-B/S detials as per appendix No. 1,           Sets
        2 3 & 4

2.      HCT Wire Saw Model SQUARER, details as per appendix No. 1,             Sets
        2 3 & 4
                                                                                                     Net total

-----------------------------------------------------------------------------------------------------------------------------------
Total Contract Value: USD CIP Shanghai, China
U.S.DOLLARS
-----------------------------------------------------------------------------------------------------------------------------------
Remarks: Prices in this contract are valid for the ordered quantities stated above. Any reduction in ordered quantities will be
subject to price revision.
-----------------------------------------------------------------------------------------------------------------------------------

</Table>
2.   COUNTRY OF ORIGIN AND MANUFACTURER: HCT SHAPING SYSTEMS SA, Switzerland
3.   Main machine will be packed in steel frame and plastic cover suitable for
     air transportation. Goods other than the main machine will be packed in
     wooden boxes. The wooden packaging materials shall be prepared and stamped
     in accordance with ISPM #15 (International Standards on Phytosanitary
     Measures issued by the International Plant Protection Council IPPC), in
     place of the Certificate of Wood Fumigation issued by the local government
     authorities.
     During the shipment transit time, the goods must be stored indoors or with
     proper shelter against rain and humidity.
     The Sellers shall be liable for any damage to the commodity and expenses
     incurred on account of improper packaging and for any rust attributable to
     inadequate or improper protective measures taken by the Sellers in regard
     to the packing.
4.   SHIPPING MARK: The Sellers shall mark on each package with fadeless paint
     the package number, gross weight, net weight, measurements and the
     wording:" Keep away from moisture" "Handle with care" "This side up " and
     the shipping mark:
                        --------------
                        SHANGHAI/CHINA
3.   TIME OF SHIPMENT: Details as per the appendix 3, subject to the advance
     payment being remitted on time. Any delay in advance payment date may delay
     shipment date.
5.   PORT OF SHIPMENT: Swiss airport, Switzerland
6.   PORT OF DESTINATION: Shanghai airport, China
7.   INSURANCE: To be covered by the Sellers
<PAGE>
8.   PAYMENT:
     a)   15% advance payment shall be effected by T/T directly deposited to the
          Sellers' bank account in Switzerland within 10 days after the contract
          is signed. The Sellers shall furnish the Buyers invoice and bank
          guarantee prior to the advance payment to be made by the Buyers.
          The Seller's bank account:
          UBS SA Lausanne, 243-FS101770.2
          IBAN CH 13 0024 3243 FS10 1770 2
          BIC UBSWCHZH80A
     b)   75% by L/C: The Buyer shall, 30 days prior to the delivery, open an
          irrevocable Letter of Credit with any official bank in P.R. China, in
          favor of the Seller, for 75% of the total value of shipment. The
          credit shall be available against Sellers' draft(s) drawn at sight on
          the opening bank for the invoice value accompanied by the shipping
          documents specified in Clause 10 hereof. Payment shall be effected by
          the opening bank by telegraphic transfer against presentation to them
          of the following draft(s) and documents. The Letter of Credit shall be
          valid for 12 months.
     c)   10% balance payment shall be effected by T/T directly deposited to the
          Sellers' bank account in Switzerland at sight of Machine Acceptance
          Protocol signed by the Buyers.
     d)   The advance payment is due within 10 days after the contract's
          signature. Otherwise, the Seller reserves the right to revise the
          contract value according to the Swiss franc prevailing exchange rate.
     e)   If the final machine acceptance at the Buyers' site does not take
          place within 5 weeks following the arrival of machine at the entry
          port/airport of destination through no fault of Sellers, the final 10%
          of payment shall become payable immediately.
     f)   All the bank charges incurred inside China shall be borne by the
          Buyers and the bank charges incurred outside China shall be borne by
          the Sellers.

9.   DOCUMENTS:
     a)   Full set of Airway bills showing freight prepaid and consigned to the
          party as instructed in the aforesaid L/C
     b)   Manually Signed Commercial invoice in 3 originals indicating the
          Contract number and shipping mark and made out in details as per the
          Contract
     c)   Certificate(s) of origin of the goods issued by the Sellers
     d)   Packing list/Weight Memo in 3 originals issued by the Sellers
     e)   Certificate of Quality and Quantity in one copy issued by the Sellers
     f)   Full set of Insurance Certificate for 110% of the invoice value,
          showing claims payable in People's Republic of China, in currency of
          the draft, blank endorsed, covering All Risks
     g)   Copy of shipping advice to the Buyers
     h)   For final 10% payment, a signed copy of machine test acceptance
          certificate

10.  SHIPMENT: CIP Terms (Airfreight)
     The Sellers shall contract on usual terms at his own expenses for the
     carriage of the goods to the agreed point at the named place of destination
     and bear all risks and expenses until the goods have been delivered to the
     first carrier.

11.  SHIPPING ADVICE:
     The Sellers shall within 2 working days after the shipment of the goods,
     advise the shipping department of the Buyers by fax of Contract No., goods
     name, quantity, value, invoiced value, invoice No., gross weight, air
     waybill No., flight No., etc.

12.  GUARANTEE OF QUALITY:
     The Sellers guarantees that the commodity hereof is made of the best
     materials with first class workmanship brand new and unused, and complies
     in all respects with quality and specifications stipulated in the Contract.
     The guarantee period shall be 15 months counting from the date on which
     the commodity arrives at the port of destination or 12 months after the
     machine acceptance test is passed, whichever comes first.
     In case of defectives judged according to the quality standard agreed by
     both the Buyers and the Sellers, following article 14 shall be observed.

13.  CLAIMS:
     Within 90 days after the arrival of the goods at destination, should the
     quality, specification or quantity be found not in conformity with the
     stipulations of the Contract except those claims for which the insurance
     company or the owners of the airfreight are liable, the Buyers, on the
     strength of the Inspection Certificate issued by the China Entry-Exit
     Inspection and Quarantine Bureau, have the right to claim for replacement
     with new goods, or for compensation, and all the expenses (such as
     inspection charges, freight for returning the goods and sending the
     replacement, insurance premium, storage and loading and unloading charges,
     etc.) shall be borne by the Sellers. As regards to the quality, the Sellers
     guarantee that if, within 12

<PAGE>
     months from the date of arrival of the goods at destination, damages occur
     in the course of operation by reason of inferior quality, bad workmanship
     or the use of inferior materials, the Buyers shall immediately notify the
     Sellers in writing and put forward a claim supported by Inspection
     Certificate issued by the China Entry-Exit Inspection and Quarantine
     Bureau. The Certificate so issued shall be accepted as the base of a claim.
     The Sellers, in accordance with the Buyers' claim shall be responsible for
     the immediate elimination of the defect(s). Where necessary, the Buyers
     shall be at liberty to eliminate the defect(s) themselves at the Sellers'
     expenses. If the Sellers fail to answer the Buyers within one month after
     receipt of the aforesaid claim, the claim shall be reckoned as having been
     accepted by the Sellers.

14.  FORCE MAJEURE:
     The Sellers shall not be held responsible for the delay in shipment or
     non-delivery of the goods due to Force Majeure, such as war, serious fire,
     flood, typhoon and earthquake, strike or other events agreed upon between
     both parties, which might occur during the process of manufacturing or in
     the course of loading or transit. The Sellers shall advise the Buyers for
     their acceptance a certificate of the accident mentioned above and within
     fourteen days thereafter, shall send by airmail to the Buyers for their
     acceptance a certificate of the accident issued by the Competent Government
     Authorities, where the accident occurs as evidence thereof. Under such
     circumstances the Sellers, however, are still under the obligation to take
     all necessary measures to hasten the delivery of the goods. In case the
     accident lasts for more than 10 weeks, the Buyers shall have the right to
     cancel this Contract.

15.  LATE DELIVERY AND PENALTY:
     Should the Sellers fail to make delivery on time as stipulated in this
     Contract, with exception of Force Majeure specified in Clause 15 of this
     Contract, the Buyers shall agree to postpone the delivery on condition that
     the Sellers agree to pay a penalty, which shall be deducted by the paying
     bank from the payment. The penalty, however, shall not exceed 5% of the
     total value of the goods involved in the late delivery. The rate of penalty
     is charged at 0.5% for every seven days, odd days less than seven days
     shall be counted as seven days. In case the Sellers fail to make delivery
     six weeks later than the time of shipment stipulated in this Contract, the
     Buyers shall have the right to cancel this Contract.

16.  ARBITRATION:
     All disputes with this Contract or the execution thereof shall be settled
     friendly through negotiations. In case no settlement can be reached, the
     case may then be submitted for arbitration to the China International
     Economics and Trade Arbitration Commission in accordance with the Rules of
     Arbitration promulgated by the said Arbitration Commission. The Arbitration
     shall take place in Shanghai and the decision of the Arbitration Commission
     shall be final and binding upon both parties; neither party shall seek
     recourse to a law court nor other authorities to appeal for revision of the
     decision. Arbitration fee shall be borne by the losing party.

17.  SPECIAL PROVISIONS:
     a)   Upon the Buyers' request, the English version of this Contract is
          translated into Chinese language for reference only. Shall there be
          any contradictions found in the Chinese translation versus the English
          version, the original English version shall prevail.
     b)   All appendixes to the Contract shall form an integral part of the
          Contract and have the same effectiveness as the Contract. IN WITNESS
          THEREOF, both parties signed this Contract in three original copies,
          each party holds one copy.

<Table>
<S>                                            <C>
The Buyers:                                    The Sellers:

LDK SOLAR HI-TECH CO., LTD.                    HCT SHAPING SYSTEMS SA

--------------------------------               --------------------------------
Date:                                          Date:
</Table>
<PAGE>
         Appendix No. 1 to Contract No.          dated
         -------------------------------------------------------------

                           Bank Guarantee information

The bank guarantee shall be sent directly to the following bank:

Remitter:           JIANGXI LDK SOLAR HI-TECH CO., LTD.
                   ------------------------------------------------------------

Bank Name in full:  INDUSTRIAL & COMMERCIAL BANK OF CHINA, JIANGXI PROVINCIAL
                    BRANCH
                   ------------------------------------------------------------

Bank Address:       2 NORTH YANGJIANG ROAD, NANCHANG, JAINGXI, CHINA
                   ------------------------------------------------------------

Swift Code          ICBKCNBJJSI
                   ------------------------------------------------------------

<PAGE>
         Appendix No. 2 to Contract No.          dated
         -------------------------------------------------------------

<Table>
<Caption>
  Pos                            Description                              Qty
-------   ----------------------------------------------------------   --------
<S>       <C>                                                          <C>
-------   ----------------------------------------------------------   --------
101       HCT Wire Saw Model E500SD-B/5
          Basic configuration including:
          One wire saw machine 3x 400V 50 Hz
          Side-by-side double ingots table (replaced standard table)
          One slurry tank with pump(s) and mixer
          Slurry flow and density measurement unit(s)
          One set of wire guides, coated and grooved
          One disposal wire spool shaft adapter
          One take-up spool and its shaft adapter
          One set of ingot holder(s) with gluing plate(s)
          Operating software for Window NT with menu in Chinese NT
          Complete set of machine documentation
          One set of standard metric tools
          One set of special HCT tools
          Modern for connection to remote computer

200       MACHINE OPTIONS (ADDITIONAL TO POS 101):
201       Set of machine consumables for the start up on site
203       Power supply failure protection for wire saw
207       Quick release hydraulic take up spool
208       Side-by-side double ingots table (replaced standard table)
209       High load feature (2x 61kw, 140kw cooling, 550L tank, BB
          cooling)
212       Metallic filter system

500       OPTIONS FOR PRODUCTION:
501       Set of wire guides standard (DIAMETER)300
505       Ingot holder (per piece)
506       Gluing plate (per piece)

600       ASSISTANT DEVICES:
603       Electrical handling unit for spool, wire-guide &
          ingot handling
604       Accessory to unload spools
605       Accessory to unload wire guides
606       Accessory to unload ingots

101       HCT Wire Saw Model SQUARER
          Basic configuration including:
          One wire saw machine 3x 400V 50Hz
          One slurry tank with pump(s) and mixer
          Slurry flow and density measurement unit(s)
          One set of wire guides, coated and grooved
          One disposal wire spool shaft adapter
          One take-up spool and its shaft adapter
          One set of ingot holder(s) with gluing plate(s)
          Operating software for Window NT with menu in Chinese NT
          Complete set of machine documentation
          One set of standard metric tools
          One set of special HCT tools
          Modern for connection to remote computer

200       MACHINE OPTIONS (ADDITIONAL TO POS 101):
201       Set of machine consumables for the start up on site
203       Power supply failure protection for wire saw

          OPTIONS FOR SQUARER:
5004      Gluing plate for multicrystalline brick for jumbo ingot

500       OPTIONS FOR PRODUCTION:
501       Set of wire guides standard (DIAMETER)300
503       Take up spool type HCT 63
</Table>

Remarks:
--------

1.   Machine Installation in China
     -----------------------------
     The Sellers shall send their engineer to the Buyers' work site in China for
     machine installation and machine acceptance tests. The duration of stay
     will be seven (7) man-days for each piece of equipment. All costs to be
     borne by the Sellers except the local transportation between hotel and work
     site.

2.   Machine Acceptance Test at the Buyer's Site
     -------------------------------------------
     After the machine is installed and trial runs are made, the Sellers'
     engineer shall carry out one cut for the machine acceptance test according
     to one of the following conditions. Both representatives shall sign the
     machine acceptance protocol if all conditions have been fulfilled. Details
     as per appendix No. 4.

<PAGE>
      Appendix No. 3 to Contract No.               dated
      -------------------------------------------------------------------

Delivery Schedule for Contract No.

<Table>
<Caption>
       Machine Type      Ex-works date      Shipment within       Routing
                        (On or before)
     ----------------  -----------------  ----------------------  ------------
<S>  <C>               <C>                <C>                     <C>
1.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
2.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
3.                                        2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
4.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
5.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
6.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
7.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
8.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
9.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
10.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
11.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
12.
                                          2 weeks                 AIR
     ----------------  -----------------  ----------------------  ------------
</Table>

                                  * * * * * * *
<PAGE>
       Appendix No. 4 to Contract No.               dated
       ------------------------------------------------------------------

For HCT Wire Saw Model E500SD-B/5

<Table>
-------------------------------------------------------------------------------
<S>                                            <C>
GENERAL INFORMATION
                                Wire saw model: Model E500SD-B/5
                                      Material: Multi silicon square wafer
                Ingot diameter or section size: 158 x 156mm
                                  Ingot length: Total ingot length for each
                                                position should not exceed
                                                500mm, including the space
                                                between ingots (due to ingot
                                                ends sqaureness)
                      Wafer thickness (as cut): 200 um

                                               ---------------------------------
                                                      Customer acceptance

CUTS REQUIREMENT
   Number of required test cuts for acceptance: 1 x full load (4 assemblies of
                                                ingot total 500mm long)
              Number of required pre-test cuts: 1 x half load (2 assemblies of
                                                ingot total 500mm long)
               Total number of ingots required: 6 assemblies of ingot total
                                                500mm long
               Test ingots quality requirement: All prime ingots, without cracks

PROCESS PARAMETERS
                           Cutting table speed: 360um/min
                                    Wire speed: According HCT definition
                                   Slurry flow: According HCT definition
                           Slurry mixing ratio: According HCT definition

CONSUMABLES DEFINITION
   Wire supplier, spool type and wire diameter: Trefil Arbed, TA100, 140um
                      Abrasive supplier & type: ESK F600
                       Coolant supplier & type: HS20

WAFER SAMPLING METHOD
                Wafers removed from statistics: Three complete sliced wafers
                                                from each ends of each ingots
                                                are discarded from test
                                                sampling. Wafers sampling shall
                                                avoid wafers from area being
                                                affected by closs-interferences
                                                of two parallel ingots due to
                                                difference in lenth.
                          Wafer sampling ratio: 20 wafers from each machine
                                                slicing position
                         Wafer sampling method: Random

WAFER MEASURING METHOD
                                Measuring tool: Mechanical sensor, Heidenhein
                               Measured points: 5 points method
                                     Saw marks: Visual check
                            Parameters checked: TV, TTV

PERFORMANCE SPECIFICATION
                                            TV: Thickness +/- 20um
                                           TTV: Max. below 50um
                                     Saw marks: None by visual check
                                    Wafer step: None by visual check
  Wafer yield (exclusively due to wire sawing): >=95%

OTHERS
                    Pre-cleaning of the wafers: (Customer's facilities)
               Return wafers (customer desire): Not applicable
-------------------------------------------------------------------------------
</Table>
<PAGE>
For HCT Model SQUARER

<Table>
-------------------------------------------------------------------------------
<S>                                            <C>
GENERAL INFORMATION
                                         Model: SQUARER
                                      Material: Multi silicon square wafer
                Ingot diameter or section size: 840 x 840 x 250mm
                                   Bricks size: 156 x 156mm

                                               --------------------------------
                                                       CUSTOMER ACCEPTANCE

CUTS REQUIREMENT
   Number of required test cuts for acceptance: 1 x full load (1 ingot 840 x
                                                840 x 250mm)
              Number of required pre-test cuts: None
               Total number of ingots required: 1 ingot
               Test ingots quality requirement: All prime ingots, without cracks

PROCESS PARAMETERS
                           Cutting table speed: 700um/min structured wire (to be
                                                confirmed for "jumbo" quality)
                         Back / forth required: Yes

CONSUMABLES DEFINITION
   Wire supplier, spool type and wire diameter: Trefil Arbed, TA 100,
                                                250um structured
                      Abrasive supplier & type: ESK F360
                       Coolant supplier & type: HS20

BRICKS MEASURING METHOD
                            Parameters checked: Size & angle

PERFORMANCE SPECIFICATION
                              Angle guaranteed: Square angle, 90 degree
                                                +/- 0.2 degree
                                   Bricks size: 156mm +/- 0.25mm
-------------------------------------------------------------------------------
</Table>

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