Document:

<PAGE>

                                                                    EXHIBIT 4.21

                             ENGLISH TRANSLATION OF
                           LEASE AND ADDENDUM TO LEASE

ABENGOA MEXICO
Edificio Corporativo

                                1. Lease Contract

<PAGE>

Lease contract entered into by the party of the first part, Abengoa Mexico S.A.
de C.V. (hereinafter the "Lessor"), represented by Mr. Norberto del Barrio Brun
and the party of the second part, Sainco Mexico, S.A. de C.V. (hereinafter the
"Lessee"), represented by Mr. Luis Rance Comes, in accordance with the following
Declarations and Clauses:

                                  Declarations

I. The "Lessor" declares:

a) That it is the owner of the property located in Bahia Santa Barbara number
   176, Colonia Veronica Anzures, Mexico D.F.

b) That it establishes its address for the purposes of notifications arising
   from the present contract, as Bahia Santa Barbara number 174, Colonia
   Veronica Anzures, Mexico D.F.

c) That it wishes to lease to the "Lessee" offices numbers 101, 201, 301, 401
   and 501 in the building 176 in Calle Bahia de Santa Barbara, in Colonia
   Veronica Anzures, Delegacion Miguel Hidalgo, hereinafter called jointly the
   "Offices".

d) That it delivers the "Offices" in the proper state of conservation and good
   sanitary and safety conditions required for it to be apt for the agreed use.

II. The "Lessee" declares:

a) That it is a company incorporated under Mexican law, as stated in Public Deed
   number 242,032 of June 15th, 1993, granted before Federal District Notary
   number 87, Mr. Tomas Lozano Medina, which is registered in the Company
   Register of said city under Mercantile Page no. 133759.

b) That its representative's faculties to formalize the present contract result
   from the instrument mentioned in the declaration immediately previous.

c) That it knows the "Offices" and wishes to lease them.

Having declared as above, the parties stipulate the following:

                                     Clauses

ONE: The "Lessor" leases the "Offices" of its property, which are in a proper
state of conservation and good sanitary and safety conditions and with all their
installations functioning and in service, to the "Lessee", who receives them for
use as offices.

TWO: Both parties agree that the "Lessee" will pay the "Lessor" in concept of
monthly rent for the "Offices", the amount of MXP 78,192.00 (Mexican Pesos
seventy-eight thousand one hundred and ninety-two and zero cents) plus Value
Added Tax. The "Lessee" will pay the rent monthly in advance to a bank account
to be determined by the "Lessor", who undertakes to notify the bank details
within five days following the signing of the present document. The parties
agree that the payment of the rent established herewithin shall be made within
the first fifteen days of the corresponding month. In the event that the rent is
paid after that date, the proportional part corresponding to the days of delay
will accrue late payment interest at a rate equal to that applicable to
Federation Treasury Bonds (CETES) at 28 days, and should such rate cease to
exist, interest will be calculated based on the investment instrument that
substitutes or is most analogous to it. This interest shall have the
consideration of agreed penalty for delay in fulfilling the rent payment
obligation, all of this without prejudice to the "Lessor's" right to rescind the
present contract for default in payment of rent in the time and form agreed
herewithin, and on the understanding that such rent will only be considered as
paid when the present agreed penalty for late payment, when appropriate, has
been settled.

The "Lessor" undertakes to deliver to the "Lessee" the tax receipts that
correspond to each payment.

The rent will be adjusted every 12 months in accordance with the inflation index
indicated by the Bank of Mexico and applicable to the period multiplied by 1.20.

<PAGE>

THREE: The "Offices" will be used exclusively as offices and may not be
dedicated to any other use without the "Lessor's" express consent, in writing.

FOUR: The lease term will be five years, completion of this term being
compulsory for both parties, to commence on the date of signing the present
document.

Should the "Lessee" wish to extend the present contract for a further three
years, it shall notify this to the "Lessor" 60 days prior to the term's expiry
date, this as long as the "Lessee" is up to date in the rent payments, in which
case the "Lessor" may refuse renewal of the present contract and request that
the properties are vacated.

FIVE: The date of termination of the lease will not produce, in any case, the
termination of the contract, which will be understood as remaining valid and
with all its effects until such time as either of the parties expressly states
the contrary, in writing and thirty (30) calendar days prior to the date the
"Offices" leased under this contract are to be made available, or until the
corresponding closure agreement is signed between the parties.

SIX: It is expressly agreed that the "Lessor" may rescind this contract if the
"Lessee":

      a) Uses any of the leased Offices for a use other than that of offices.

      b) Sub-lets or in any other way assigns, wholly or partially, the
      "Offices, without written consent from the "Lessor".

      c) Fails to punctually pay the rent, in the manner stipulated in Clause
      One.

      d) Carries out works of whatsoever nature within or outside the "Offices",
      without due authorization, in writing, from the "Lessor".

      e) Occupies, assigns or rents out any area of the communal areas.

SEVEN: The "Lessor", during the term of the lease, undertakes to pay any amounts
for the "Building" services, such as electricity, telephone, water, elevator
maintenance and analogous. For the purposes of the aforementioned, the parties
agree that the "Lessee" shall deliver to the "Lessor", every two months, copies
of proof of payment of said services.

EIGHT: The "Lessee" delivers to the "Lessor", at the time of signing this
contract, the amount of MXP 78,192.00 (Mexican Pesos seventy-eight thousand one
hundred and ninety-two and zero cents) equal to one month's rent, in concept of
deposit as surety for consumption of water, electricity, telephone and any other
service or against any extraordinary deterioration to the "Offices". Once the
lease has finalized, whether due to early agreed termination or upon maturity of
the contract term, the "Offices" have been returned without any deterioration
and proof has been provided of all the services corresponding to the "Lessee",
the "Lessor" will return the sum mentioned in this clause to the "Lessee",
within a period of 30 calendar days following vacation of the properties and
delivery of the "Offices", all of this as long as the "Lessee" has fulfilled
each and every one of the stipulations contained in the present contract.
Furthermore, the "Lessee" will deliver to the "Lessor" a surety of MXP 78.192.00
(Mexican Pesos seventy-eight thousand one hundred and ninety-two and zero
cents), equal to one month's rent, as surety for the rent payments, such surety
to be kept effective at all times during the term of the Lease and will only be
cancelable with the "Lessor's" prior consent, in writing.

NINE: The "Lessee" may not, under any right or for any concept, discount from
the monthly rent any expense in which it incurs unless it obtains the prior and
written consent of the "Lessor".

TEN: The parties agree that any pact they may establish in relation to the
present contract shall be necessarily set out in writing, therefore rendering
without any legal effect whatsoever any allegation put forward by the "Lessee"
of having reached a verbal agreement with the "Lessor" or its representative on
any other contract, extension, substitution, release, remission, authorization
to sub-let, assign or transfer the rights derived from the present contract,
improvements, use other than that agreed, promise to sell, purchase-sale,
occupation of other or additional areas, etc.

ELEVEN: The "Lessee" recognizes and accepts that it receives the "Offices" with
all its accessories in the proper state of conservation and good sanitary and
safety conditions required for it to be apt for the agreed use.

Any improvements that the "Lessor" carries out in the building will become part
of this upon termination of the contract. Upon maturity of the contract, the
"Lessee" undertakes to return the "Offices" in the same state in which they are
received.

<PAGE>

TWELVE: The "Lessee" may not, under any concept, sub-let or transfer the lease
of the "Offices" and use of the "Offices" by the "Lessee" for any activity other
than the agreed use, without prior, written consent from the "Lessor", will be
considered sufficient cause to rescind the contract.

THIRTEEN: The parties agreed to submit the interpretation and performance of the
present contract to the Legislation and the Federal District Tribunals, waiving
any jurisdiction that may correspond for their present or future places of
residence.

FOURTEEN: The parties declare in this act that there are no defects in their
consent and ratify that they wish to bind themselves by the terms of the
contract, given that the contract contains no illicit clauses, for which the
contract having been read and the parties being aware of its contents and the
legal implications of its clauses, the appearing parties, informed on its
validity and legal effects, sign it in duplicate and as testimony, in the City
of Mexico, D.F., January 1st, 2003.

The "Lessee"                               The "Lessor"
[Signature: Illegible]                     [Signature: Illegible]

Sainco Mexico S.A. de C.V.                 Abengoa Mexico, S.A. de C.V.
Represented by Mr.                         Represented by Mr.
Luis Rance Comes                           Norberto del Barrio Brun

<PAGE>

                             REFERENCE: PREDIAL ACCOUNT NUMBER: 029-038-04-002-7
                                                                029-038-04-004-3
                                                                029-038-04-006-8
                                                                029-038-04-007-6
                                                                029-038-04-008-4

Addendum to the Lease of offices 101, 201, 301, 401 and 501 in the building
located at Bahia de Santa Barbara, No. 176 Col. Veronica Anzures, Mexico
(hereinafter the building) signed by the Lessor, Abengoa Mexico, S.A. de C.V.
(hereinafter Abengoa), represented by Norberto del Barrio Brun and as the Lessee
Telvent Mexico, S.A. de C.V. (hereinafter Telvent and jointly referred to along
with Abengoa as the Parties) represented by Enrique Barreiro Nogalego, based on
the following background, declarations and clauses:

                                   BACKGROUND

1. On January 1, 2003 the Parties signed a lease on the building (hereinafter
the Contract) which has the following predial account numbers:
029-038-004-002-7; 029-038-004-004-3; 029-038-004-006-8; 029-038-004-004-7,
029-038-004-008-4.

2. In the fourth clause of the Contract the Parties established that.

      FOUR. The mandatory term of the lease is five years for both parties,
      starting on the date on which this instrument is signed.

      If the "Lessee" wishes to renew this agreement for three more years, it
      shall notify the "Lessor" in writing sixty days in advance of the
      expiration date, provided that the "Lessee" is up to date in the payment
      of rent. Otherwise, the "Lessor" may refuse to renew this lease and ask
      the Lessee to vacate.

2. The last paragraph of the second clause of the Contract between the parties
   establishes that:

   "...The rent will be adjusted every 12 months based on the inflationary
   index indicated by the Bank of Mexico applicable to the period, multiplied by
   1.20..."

3. On April 24, 2003, the Lessee, Sainco Mexico, S.A. de C.V. changed its name
   to Telvent Mexico, S.A. de C.V. The Lessor was notified of this change and
   made a note of it for future reference.

4. In the month of December 2004, the Bank of Mexico published that the
   inflationary index for the last full year was 5.43%. That percentage,
   multiplied by 1.20 as agreed by the parties, gives a total of 6.52%. This is
   therefore the percentage by which the rent for 2005 should be adjusted.

<PAGE>

                                  DECLARATIONS

   a) They acknowledge the legal status and capacity with which their legal
      representatives execute this instrument, being duly empowered to bind
      their principals in the terms and conditions set forth herein.

   b) It is their desire to execute this instrument by virtue of which, in
      compliance with the provisions of the last paragraph of the second clause
      of the Contract, the monthly rent is hereby adjusted.

   c) Since the parties have reached an agreement as to the scope of this
      instrument, they establish the following

                                     CLAUSES

ONE. The parties acknowledge that the facts narrated in the background
information and declarations are the basis for the execution of this instrument.

TWO. By virtue of this instrument, the parties hereby adjust the annual amount
of the monthly rent under the Contract so that starting in the month of January
2005 the monthly rent payable by Telvent will be $87,270.00 (eighty-seven
thousand two hundred seventy pesos and 00/100) plus Value added Tax. The
breakdown for each office is as follows:

<TABLE>
<CAPTION>
        OFFICE           PREDIAL NUMBER           RENT
        ------          ----------------    ----------------
<S>     <C>             <C>                 <C>
1         101           029-038-04-002-7          $17,450.00
2         201           029-038-04-004-3          $17,450.00
3         301           029-038-04-006-8          $17,450.00
4         401           029-038-04-007-6          $17,450.00
5         501           029-038-04-008-4          $17,450.00
                                            Total $87,270.00
</TABLE>

For the interpretation and fulfillment of this contract, the parties agree to by
bound by the laws of the courts of the Federal District, expressly waiving any
other present or future jurisdiction which could apply.

This instrument is signed in duplicate in Mexico, D.F. on January 3, 2005.

          "CLIENT"                                 "PROVIDER"

/s/ ENRIQUE BARREIRO NOGALEDO             /s/ NORBERTO DEL BARRIO BRUN
-----------------------------             ----------------------------
TELVENT MEXICO, S.A. DE C.V.              ABENGOA MEXICO, S.A. DE C.V.
   R.F.C.: AME-970520-MJ3                    R.F.C.: TME-900620-3Q6
Mr. Enrique Barreiro Nogaledo             Mr. Norberto del Barrio Brun<PAGE>

                                                                    EXHIBIT 4.22

                             ENGLISH TRANSLATION OF
                         NOTARIAL CERTIFICATE AND LEASE

FIFTEENTH  NOTARIAL OFFICES OF THE CITY OF LISBON

NOTARY RESPONSIBLE

Attorney JOSE MANUEL CABRAL DE MATOS OLIVEIRA

Avenida Duque de Loule 104 - Basement - 1050-092 LISBON

TELEPHONE: 21333904 or 213534669   FAX: 213546743

                                     *******

I HEREBY CERTIFY THAT:

I made this photocopy that is equal to the original of the Deed issued by this
Notarial Office and recorded in the Book of Miscellaneous Deeds number 245 "I",
page 9 through 11, and of the complementary Document issued according to the
terms of item 2 of article 64 of the Notarial Code.

Lisbon, Fifteenth Notarial Offices  on June 29 2000

ASSISTANT, SUPERIOR CLERK

BILL
Art. 8 # 1   1,000,500
"    " # 2     800,500
Total        1,800,500

illegible
Checked and recorded under number 3750

<PAGE>

                                      LEASE

_____ On the twenty first day of June of the year two thousand, the following
principals did appear before me, Jose Manuel Cabral de Matos Oliveira, attorney
and Notary with the Fifteenth Notarial Offices of the municipality of Lisbon:

_____ FIRST - a) Dr. PEDRO NEUPARTH DE SARREA GAIVAO, married, born in the
district of S. Sebastiao da Pedreira, municipality of Lisbon, domiciled in this
city at Rua Marques da Fronteira, # 72/74, 9th floor right;

              b) Dr. EDUARDO MANUEL MILHEIRICO DE CARVALHO CHAVES, born in
Mozambique, domiciled at Rua Costa Pinto # 163, 2nd floor A, in Paco de Arcos,
Oeiras, as acting managers and representatives of "MC-IMOVEST, SOCIEDADE GESTORA
DE FUNDOS DE INVESTIMENTOS IMOBILIARIOS, S.A.", previously known as "SOCIEDADE
GESTORA DE IMOVEST - FUNDO DE INVESTIMENTOS IMOBILIARIOS, S.A.", a corporation
with its main offices in this city, at Avenida da Republica number forty three,
first floor, tax number NIPC 501 845 755, with a registered share capital of one
hundred and fifty million Escudos, registered in the Lisbon Commercial Registry
under number SIXTY FIVE THOUSAND NINE HUNDRED AND EIGHTY ONE, and this
corporation, in its capacity as the managing entity and legal representative of

"IMOVEST - FUNDO DE INVESTIMENTOS IMOBILIARIOS", and responsible for its
management under the terms of the Administrative Ruling issued by the State
Treasury Secretariat and published in the Diario da Republica (Official
Gazette), Series Two, number eighty nine, on April sixteen, nineteen hundred and
eighty seven, the terms of which I have verified by means of a Certificate
issued by the Lisbon Commercial Registry office, and filed as an integral part
of the deed issued and recorded on page ninety eight of Book number two hundred
and twenty eight - I.

_____ SECOND - JOSE JAVIER GONZALES SOLANO, born in Spain, married, domiciled at
Rua Genaro Parlade # 8, Seville, Spain, who appears in the quality of
representative of

     "CARRIERHOUSE, S.A.", a corporation with its main offices at Isabel
Colbrand, number eight, in Fuencarral, Madrid, Spain, registered in the Madrid
Registry Office in volume thirteen thousand eight hundred and ninety one, of
Book eighty one, section eight A, page two hundred and twenty seven thousand
three hundred and seventy, first registry, qualifications and powers that I
checked, in view of the Power of Attorney that I hereby file.

_____ I have personal knowledge of the first principals and thereby verified
their identity, the identity of the remaining principal was checked against i.d.
number 80.116.735, issued on January 4 1991 in Seville by the Police Authority
of that city, and that was presented to me.

THE FIRST PRINCIPLES HEREBY STATE AND WARRANT THAT:

_____ through this deed, "IMOVEST - FUNDO DE INVESTIMENTOS IMOBILIARIOS", the
corporation by them represented, leases to the second principal, the self
contained premises described below:

_____ The unit identified by the letter "A", corresponding to ground floor unit
A, to be used as a warehouse, said lease to include the basement where the
garage assigned unit A is located;

_____ The unit identified by the letter "B" , corresponding to ground floor unit
B, to be used as a warehouse, said lease to include the basement where the
garage assigned unit B is located; and

_____ The unit identified by the letter "C", corresponding to the first floor,
to be used as a warehouse. All of the premises described are contained in an
urban condominium building located at Avenida Severiano Falcao number fourteen,
district of Prior Velho, municipality of Loures, described in the Second
Property

<PAGE>

Registry of Loures, under number TWO HUNDRED AND FOURTEEN, in that district,
where it is registered as a condominium under registration F one, dated August
30 1999, and purchased through a deed issued today, and registered in this same
Book of Deeds on page six.

_____ Said building is registered in the Land Registry under article number
seven hundred and ninety six.

____ This lease is entered into according to the terms and covenants contained
in the complementary Document drawn up according to the terms of item two of
article sixty four of the Notarial Code. Said Document is considered an integral
part of this deed and the parties hereby state they have read and accept its
terms and covenants therein.

_____ The term of the lease is seven years, said term being renewable for
successive one year periods. The effective date is the twenty first day of June
of the year in course. The leased premises shall be used by the lessee as a
warehouse

_____ The monthly aggregate lease fee shall be SEVEN MILLION TWO HUNDRED AND
THIRTY FOUR THOUSAND SIX HUNDRED AND FIFTY ESCUDOS, of which two million five
hundred and fifteen thousand and fifty Escudos for unit "A", two million five
hundred and eleven thousand Escudos for unit "B" and two million two hundred and
eight thousand six hundred Escudos for unit "C".

THE SECOND PRINCIPAL HEREBY STATES AND WARRANTS THAT:

_____ He accepts the terms of the lease for the corporation he represents.

____ I hereby file the complementary Document referred to above.

_____ Exhibits:

a) A Certificate issued by the above mentioned Land Registry on February 28
last, whereby I was able to verify the number of registration of the leased
premises, their description and confirmation that the building is a condominium;

b) Three photocopies in lieu of the respective Property Certificates, issued by
the Fourth Financial Office of Loures, initialed on March 31 last, through which
I checked the Registration Number; and

c) A photocopy made by the Oeiras Notary Office on April 21 1998, of Use Permit
215/98, issued by the Loures Municipal Board on April 7 1998, stating that the
premises located in the building in question are suitable for use as warehouses.

This deed was read to the Principals and the content was explained out loud,
with all principals present simultaneously. The value of the transaction is five
hundred and seventy five million eight hundred and eleven thousand Escudos, and
the agreement is scheduled to be executed at seventeen hundred hours and thirty
minutes.

Signatures illegible

<PAGE>

Book # 245 I Page 9

Doc # ___  Page

COMPLEMENTARY DOCUMENT PREPARED ACCORDING TO THE TERMS OF ARTICLE SIXTY FOUR OF
THE NOTARIAL CODE, THIS DOCUMENT IS AN INTEGRAL PART OF THE DEED RECORDED IN
PAGE 6 OF BOOK 245 I OF THE 15TH Notarial Office of the City of Lisbon.

                                       ONE

1. This lease shall be governed by the "free income regime" according to the
terms of the Urban Lease Regime, and shall be in effect for a period of seven
years, starting on the date of signature of the public deed.

2. The contract shall be automatically renewed for successive one year periods.
The lessee may only terminate this contract by submitting written notice no
later than ninety days before the end of the first seven year period or before
the end of each renewal period.

                                       TWO

1. The aggregate monthly lease shall be seven million two hundred and thirty
four thousand six hundred and fifty Escudos, of which two million five hundred
and fifteen thousand and fifty Escudos for unit "A", two million five hundred
and eleven thousand Escudos for unit "B" and two million two hundred and eight
thousand six hundred Escudos for unit "C".

Section one: Given that the units must be altered to adapt them to the
activities of the lessee, the lease for the first year shall be:

a) For Unit "A", for the first six months the monthly lease shall be five
hundred and sixty thousand Escudos, for the following six months it shall be one
million one hundred and twenty thousand Escudos.

b) For Units "B" and "C", for the first five months the monthly lease shall be
two million three hundred and fifty nine thousand eight hundred Escudos, of
which one million two hundred and fifty five thousand five hundred Escudos for
unit "B" and one million four hundred and four thousand and thirteen Escudos for
unit "C". For the remaining seven months of the year the monthly lease for these
two units shall be the amount described in item 1 of this clause.

2. The lease shall be deposited in the account indicated by the landlord, in
advance, no later than the eighth day of the month immediately proceeding the
month in question. The lease fee is due as of the date of signature of the lease
deed.

3. Without prejudice of the provisions described below, the amount of the lease
shall be adjusted annually, based on the coefficient used to update
non-residential leases. The first adjustment shall be made on July first two
thousand and one, based on the amount described in item one of this clause, and
subsequent adjustments shall be made successfully at one year intervals.

4. To the lease fee shall be added the amounts paid in city sanitation taxes, as
well as the condominium fees and expenses for the leased units. These amounts
shall be paid within thirty days of receiving the receipt or proof of payment
thereof.

<PAGE>

                                      THREE

1. The leased premises shall be used by the lessee as a warehouse.

2. The lessee is hereby authorized to assign its contractual position and/or
sub-lease the premises in whole or in part, so long as said assignment or
sub-lease is to an affiliate company or to a corporation of which the lessee is
an affiliate.

3. The lessee is authorized to allow other companies of the ABENGOA group to use
a part of the premises, said use not being considered a sub-lease, contractual
assignment, transfer or conveyance of exploration rights.

4. The lessee may, within the scope of its activities as a provider of
outsourced services, install, keep and operate third party equipment on the
premises, without this being considered by the landlord to be a sub-lease,
contractual assignment, transfer or conveyance of exploration rights.

5. The rights granted in the preceding numbers shall not, under any
circumstance, result in any increase in the lease amount nor in any change in
the terms of the lease contract.

                                      FOUR

1. The premises are leased "as is", and the lessee hereby states that it is
fully aware of the conditions the premises are in.

2. The landlord agrees to allow the lessee to make whatever alterations are
required to adapt the premises for the purposes described in this lease, at the
expense of the lessee, as well as make any changes and alterations that may
become necessary in future or for maintenance purposes, so long as these in no
way impact the structure of the building or its common parts.

3. Upon termination of the lease contract, the lessee may remove any remaining
betterments or improvements made to the premises or common areas, without the
need for any indemnification, so long as said removal in no way causes a
deterioration of the premises or common areas.

4. Without prejudice of the provisions in number two of this clause, the lessee
must submit to the landlord the projects describing the implementation of the
betterments or alterations.

5. During the term of the lease contract, the landlord agrees to keep the common
areas in compliance with all applicable safety and fire prevention regulations.

                                      FIVE

1. The lessee may likewise, at its own expense and risk, install in the common
areas, specifically on the terrace or building roof, air conditioning units,
electrical installations, dish antennas and/or other communication devices. The
lessee may also place its logo or the logo of its clients on the inside and/or
the outside of the building so as to make its presence known.

2. The equipment installed must not cause acoustic perturbations, vibrations or
leaks and the lessee hereby agrees to take all measure required to avoid such
situations.

3. The installation and maintenance of the equipment listed above shall be the
exclusive responsibility of the lessee, and must respect the ducts already
existing on the roof; further. these installations shall not be such as to
impede any other facilities of a similar or different nature, at present or in
future.

4. Upon termination of the lease contract the lessee shall remove all equipment
from the roof, at its own expense, and return it to its original configuration.

<PAGE>

                                       SIX

All communications concerning this contract shall be made in writing, by telefax
or registered, return receipt letter, and shall be considered received on the
date of delivery.

                                      SEVEN

The lessee shall have a period of thirty days, from the date on which the
landlord informs the lessee, in writing, of the sale conditions, to exercise its
right of preference.

                                      EIGHT

The parties hereby elect the courts of the County of Lisbon as the venue to
resolve any dispute arising out of this contract, expressly renouncing all
others.

Signatures (illegible)

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