Document:

Exhibit 10.3

                   LLC INTEREST AND WARRANT PURCHASE AGREEMENT

                  THIS LLC INTEREST AND WARRANT PURCHASE AGREEMENT,  dated as of
October 16, 2000 (this "Agreement"), is made by and among Zecal Technology, LLC,
a Delaware limited liability company ("LLC"), HTI Z Corp. (f/k/a Zecal Corp.), a
Delaware corporation ("HTI") and LZ Partners,  LLC, a Delaware limited liability
company  ("LZ").  HTI  and  LZ  are  referred  to  herein  collectively  as  the
"Purchasers" and individually as a "Purchaser."  Except as otherwise  indicated,
capitalized terms used herein are defined in Section 6 hereof.

                  Subject  to the terms and  conditions  set forth  herein,  LLC
desires  to sell,  and LZ and HTI desire to  purchase,  certain  securities  and
warrants of LLC.

                  The parties hereto agree as follows:

                  Section 1.        Authorization; Purchase and Sale.
                                    --------------------------------

                  1A. On or before the date hereof, LLC will have authorized (i)
the sale to LZ of (a)  Preferred  Company  Interests  representing,  immediately
following  the   consummation  of  the  transactions   contemplated   hereunder,
approximately  24.7% of the entire  Company  Interest of LLC (the "LZ  Preferred
Company  Interests") and (b) Warrants,  substantially  in the form of Appendix A
hereof,  to purchase  $3,000,000  of  Preferred  Company  Interests  (the "First
Warrant"  and,  together  with  the LZ  Preferred  Company  Interests,  the  "LZ
Equity"),  for the aggregate purchase price of $3,000,000;  and (ii) the sale to
HTI of Preferred  Company  Interests  representing,  immediately  following  the
consummation of the transactions  contemplated hereunder,  approximately 9.3% of
the entire Company Interest of LLC (the "HTI Preferred  Company  Interests" and,
together with the LZ Equity,  the "Securities") for the aggregate purchase price
of $1,125,000.

                  1B.  LLC  agrees  to  sell  and,  subject  to  the  terms  and
conditions set forth herein,  each of the Purchasers  agrees,  severally but not
jointly,  to purchase  (i) in the case of LZ, the LZ Equity and (ii) in the case
of HTI,  the HTI  Preferred  Company  Interests,  in each case at the  aggregate
purchase price set forth in Section 1A hereof.

                  1C. At the  Closing  (as  defined in  Section  2A below),  the
Purchasers  shall pay the  purchase  price set forth in Section 1A by  certified
check or wire transfer of  immediately  available  funds and (i) with respect to
the LZ Preferred Company Interests and HTI Preferred Company Interests, LLC will
register upon its books the purchase of such Preferred  Company Interests by the
Purchasers  and (ii) with respect to the First  Warrant,  LLC will deliver to LZ
the First Warrant executed by a duly authorized officer of LLC.

                  Section 2.        Closing of the Transactions.
                                    ---------------------------

                  2A.      The Closing.  The closing of the sale and purchase of
                           -----------
the  Securities  (the  "Closing")  will occur at a place  mutually  agreeable to
Purchasers  and LLC at 10:00  a.m.,  Chicago  time,  as of the date  hereof (the
"Closing Date").

<PAGE>

                  Section 3.        Restrictions on Transfers.
                                    -------------------------

                  3A.      Restrictions.     THE TRANSFER OF ANY INTEREST IN LLC
IS SUBJECT TO THE CONDITIONS AND  RESTRICTIONS ON TRANSFER  CONTAINED IN THE LLC
AGREEMENT AND THE MEMBERS AGREEMENT,  WHICH RESTRICTIONS ARE INCORPORATED HEREIN
BY REFERENCE.

                  Section 4.        Representations and Warranties of LLC.
                                    --------------------------------------
LLC hereby represents and warrants to each Purchaser that as of the Closing:

                  4A. Organization, etc. LLC is a limited liability company duly
organized, validly existing and in good standing under the laws of Delaware. LLC
possesses  all  requisite  power  and  authority  necessary  to  carry  out  the
transactions contemplated by this Agreement.

                  4B.  Authorization;  No Breach.  The  execution,  delivery and
performance of this Agreement and the other  agreements  contemplated  hereby to
which  LLC is a party  have  been duly  authorized  by LLC and no other  limited
liability  company act or proceeding on the part of LLC, its board or members is
necessary to authorize the  execution,  delivery or  performance  by LLC of this
Agreement or any other agreement  contemplated  hereby to which it is a party or
the  consummation  of the  transactions  contemplated  hereby or  thereby.  This
Agreement  has been  duly  executed  and  delivered  by LLC and  this  Agreement
constitutes  a valid and binding  obligation of LLC,  enforceable  in accordance
with its terms.  The  execution  and delivery by LLC of this  Agreement  and the
fulfillment  of and  compliance  with the terms hereof by LLC does not and shall
not (i)  conflict  with or  result  in a  breach  of the  terms,  conditions  or
provisions  of, (ii)  constitute a default  under  (whether  with or without the
giving of notice,  the passage of time or both), (iii) result in the creation of
any lien upon LLC's  assets  pursuant to, (iv) give any third party the right to
modify,  terminate or accelerate any obligation under, (v) result in a violation
of or (vi)  require any  authorization,  consent,  approval,  exemption or other
action  by  or  notice  or  declaration   to,  or  filing  with,  any  court  or
administrative  or governmental  body or agency pursuant to, the  organizational
documents  of LLC,  or any law,  statute,  rule or  regulation  to which  LLC is
subject, or any agreement, instrument, order, judgment or decree to which LLC is
subject.

                  4C.      No Registration.  Assuming the truth and accuracy of
                           ---------------
the  representations  set forth in  Section 5 hereof,  the offer and sale of the
Securities  pursuant to the terms hereof are not required to be registered under
the Securities Act or any state securities laws.

                  4D.      Capitalization.  Immediately following the
                           --------------
consummation of the transactions  contemplated hereunder,  the capitalization of
LLC shall be as set forth in Schedule 4D hereof.

                  Section 5.        Purchasers' Representations and Warranties.
                                    ------------------------------------------

                  5A.  Purchasers'  Investment  Representations.  Each Purchaser
hereby  represents,  severally  but  not  jointly,  that  it  is  acquiring  the
Securities  purchased  by it  hereunder  for its own  account and that it has no
present  intention  of  selling  such  securities  in a public  distribution  in
violation of the federal  securities  laws or any  applicable  state  securities
laws; provided that nothing contained herein will prevent such Purchaser and the
subsequent holders of Securities from

                                       2
<PAGE>

transferring  such  securities in compliance  with the  provisions of any law or
contract applicable to such Purchaser or holders, as applicable.

                  5B.        Other Representations and Warranties of Purchasers.
                             ---------------------------------------------------
Each Purchaser hereby represents and warrants, severally but not jointly, to LLC
that:

                  (i) Such Purchaser (a) is an "accredited  investor" as defined
         in  Rule  501(a)  under  the  Securities  Act or (b) by  reason  of its
         business and  financial  experience,  and the  business  and  financial
         experience  of those  retained  by it to advise it with  respect to its
         investment in the Securities  being purchased  hereunder,  it, together
         with such advisors,  has such knowledge,  sophistication and experience
         in business and financial matters so as to be capable of evaluating the
         merits and risks of its prospective  investment in such securities,  is
         able to bear the economic risk of such  investment  and, at the present
         time, is able to afford a complete loss of such investment; and

                  (ii) (a) Such Purchaser has the requisite  power and authority
         to purchase the  Securities  to be  purchased  by it hereunder  and has
         authorized the purchase of such securities,  (b) this Agreement and the
         purchase of the Securities  hereunder  constitutes the legal, valid and
         binding  obligation of such  Purchaser,  enforceable in accordance with
         its terms, and (c) the execution and delivery by such Purchaser of this
         Agreement and the  fulfillment of and compliance  with the terms hereof
         by such Purchaser does not and shall not (1) conflict with or result in
         a breach of the terms,  conditions or provisions  of, (2)  constitute a
         default  under  (whether  with or without  the  giving of  notice,  the
         passage of time or both),  (3) result in the  creation of any lien upon
         such Purchaser's assets pursuant to, (4) give any third party the right
         to modify,  terminate or accelerate any obligation under, (5) result in
         a violation  of or (6) require any  authorization,  consent,  approval,
         exemption  or other  action by or notice or  declaration  to, or filing
         with,  any  court or  administrative  or  governmental  body or  agency
         pursuant to, the  organizational  documents of such  Purchaser,  or any
         law, statute, rule or regulation to which such Purchaser is subject, or
         any  agreement,  instrument,  order,  judgment  or decree to which such
         Purchaser is subject.

                  Section 6.        Definitions.
                                    -----------

                  "Company Interest" is defined in the LLC Agreement.

                  "LLC Agreement" means that certain Limited  Liability  Company
Agreement, dated as of May 5, 2000, among the members of LLC listed therein.

                  "Members  Agreement"  means that  certain  Members  Agreement,
dated as of May 5, 2000, among LLC and the members of LLC listed therein.

                  "Person" means an individual, a partnership,  a joint venture,
a corporation,  a trust, an unincorporated  organization and a government or any
department or agency thereof.

                  "Preferred Company Interests" is defined in the LLC Agreement.

                                       3
<PAGE>

                  "Securities Act" means the Securities Act of 1933, as amended,
or any similar federal law then in force.

                  Section 7.        Miscellaneous.
                                    -------------

                  7A.  Remedies.  The holders of Securities  acquired  hereunder
(directly or  indirectly)  will have all of the rights and remedies set forth in
this  Agreement,  the LLC  Agreement and the Members  Agreement,  and all of the
rights and  remedies  which such holders have been granted at any time under any
other  agreement  or  contract,  and all of the rights and  remedies  which such
holders have under any law. Any Person  having any rights under any provision of
this Agreement will be entitled to enforce such rights specifically,  to recover
damages  by reason of any  breach of any  provision  of this  Agreement,  and to
exercise all other rights granted by law.

                  7B.  Additional  LZ  Investment.  Each of the  parties  hereto
agrees and  acknowledges  that at any time on or before  December 31,  2000,  LZ
shall have the right (but not the obligation) to purchase an additional $375,000
of Preferred Company Interests of LLC (the "LZ Investment Option"). In the event
LZ exercises the LZ Investment Option, LZ shall receive Warrants,  substantially
in the form of Appendix B hereof,  to purchase  $750,000  of  Preferred  Company
Interests  (the  "Second  Warrant").  Notwithstanding  anything to the  contrary
contained herein or in the Members Agreement,  the exercise of the LZ Investment
Option shall not entitle HTI to purchase  any  additional  Company  Interests of
LLC.

                  7C.      Limited Waiver of Members Agreement Provisions.
                           -----------------------------------------------
Each of the Purchasers agrees and acknowledges that:

                  (i)  notwithstanding  the  provisions  of Section 11(a) of the
         Members  Agreement  which permit each Member (as defined in the Members
         Agreement)  to provide all, but not less than all, of such Member's pro
         rata  share  of any  additional  financing  of  LLC,  HTI is  providing
         $1,125,000 of the $4,500,000 of additional financing called for in that
         certain Call Notice, dated September 25, 2000 (the "Call Notice");

                  (ii)  notwithstanding  the  provisions of Section 11(c) of the
         Members  Agreement which would entitle LZ to warrants for $9,000,000 of
         Preferred  Company Interests because HTI declined to provide all of its
         pro rata share of additional  financing  called for in the Call Notice,
         LZ has  consented  to receive  warrants  for  $3,000,000  of  Preferred
         Company Interests (i.e., the First Warrant); and

                  (iii) each of the waivers of the aforementioned  provisions of
         the  Members  Agreement  set forth in  Section  7C(i)  and (ii)  hereof
         represent a limited,  one-time,  and specific waiver of such provisions
         and  shall in no way be  deemed  to  otherwise  modify  the  terms  and
         conditions of the Members  Agreement except with respect to the limited
         waivers described above.

                  7D.      Amendments and Waivers.  Except as otherwise provided
                           ----------------------
herein,  no  modification,  amendment or waiver of any provision hereof shall be
effective against LLC or either Purchaser unless such modification, amendment or
waiver is  approved  in  writing  by LLC and any such  affected  Purchaser.  The
failure of any party to enforce any provision of this Agreement or under any

                                       4
<PAGE>

agreement  contemplated hereby or under the LLC Agreement or the bylaws shall in
no way be  construed  as a waiver of such  provisions  and shall not  affect the
right of such party  thereafter  to  enforce  each and every  provision  of this
Agreement,  any agreement referred to herein,  the certificate of formation,  or
the bylaws in accordance with their terms.

                  7E.   Survival  of   Representations   and   Warranties.   All
representations and warranties  contained herein or made in writing by any party
in  connection  herewith  will  survive  the  execution  and  delivery  of  this
Agreement, regardless of any investigation made by LLC or either Purchaser or on
its behalf.

                  7F.      Successors and Assigns.
                           ----------------------

                  (i)  Except  as  otherwise   expressly  provided  herein,  all
         covenants and agreements contained in this Agreement by or on behalf of
         any of the  parties  hereto  will bind and inure to the  benefit of the
         respective  successors and assigns of such parties whether so expressed
         or not. In addition, and whether or not any express assignment has been
         made, the provisions of this  Agreement  which are for any  Purchaser's
         benefit as the purchaser or holder of  Securities,  as the case may be,
         are also for the benefit of and enforceable by any subsequent holder of
         such Purchaser's Securities.

                  (ii) If a sale,  transfer,  assignment or other disposition of
         any  Securities  is made in  accordance  with  the  provisions  of this
         Agreement  to any  Person  and such  securities  remain  subject to the
         transfer restrictions  described herein, such Person shall, at or prior
         to the time such securities are acquired, execute a counterpart of this
         Agreement  with  such  modifications  thereto  as may be  necessary  to
         reflect such acquisition,  and such other documents as are necessary to
         confirm such  Person's  agreement to become a party to, and to be bound
         by,  all   covenants,   terms  and  conditions  of  this  Agreement  as
         theretofore amended.

                  7G.  Severability.  Whenever possible,  each provision of this
Agreement  will be interpreted in such manner as to be effective and valid under
applicable  law, but if any  provision of this  Agreement is held to be invalid,
illegal or unenforceable  under any applicable law or rule in any  jurisdiction,
such  provision  will be  ineffective  only to the  extent  of such  invalidity,
illegality or  unenforceability in such jurisdiction,  without  invalidating the
remainder of this Agreement in such  jurisdiction or any provision hereof in any
other jurisdiction.

                  7H.      Counterparts.  This Agreement may be executed
                           ------------
simultaneously  in two or more  counterparts,  any one of which need not contain
the signatures of more than one party, but all such counterparts  taken together
will constitute one and the same Agreement (any one of which may be delivered by
facsimile).

                  7I.      Descriptive Heading.  The descriptive headings of
                           -------------------
this Agreement are inserted for convenience only and do not constitute a part of
this Agreement.

                  7J.      Governing Law.  All issues concerning the
                           -------------
enforceability,  validity and binding effect of this Agreement shall be governed
by and construed in accordance  with the laws of the State of Delaware,  without
giving effect to any choice of law or conflict of law provision or rule(whether

                                       5
<PAGE>

of the  State of  Delaware  or any  other  jurisdiction)  that  would  cause the
application of the law of any jurisdiction other than the State of Delaware.

                  7K. Notices.  All notices,  demands or other communications to
be given or delivered  under or by reason of the  provisions  of this  Agreement
will be in  writing  and will be  deemed  to have  been  given  when  personally
delivered or received by certified mail,  return receipt  requested,  or sent by
guaranteed overnight courier service.  Notices,  demands and communications will
be sent to any Purchaser at such  Purchaser's  address  indicated in LLC's books
and records and to LLC at the addresses indicated below:

                  Notices to LLC:
                  --------------

                  Zecal Technology, LLC
                  c/o Lamb Partners
                  900 N. Michigan Avenue
                  Chicago, IL 60611
                  Telecopy No.: (312) 915-1037
                  Attn: Neil G. Bluhm

                  With a copy to:
                  --------------

                  Kirkland & Ellis
                  200 E. Randolph Drive
                  Chicago, Illinois 60601
                  Telecopy No.: (312) 861-2200
                  Attention: Gary M. Holihan, Esq.

or to such  other  address  or to the  attention  of such  other  Person  as the
recipient party has specified by prior written notice to the sending party.

                   *     *     *     *     *

                                       6
<PAGE>

                  IN WITNESS WHEREOF,  the parties hereto have executed this LLC
Interest and Warrant Purchase Agreement on the day and year first above written.

                                            ZECAL TECHNOLOGY, LLC

                                            By:      ___________________________

                                            Its:     ___________________________

                                            LZ PARTNERS, LLC

                                            By:      ___________________________

                                            Its:     ___________________________

                                            HTI Z CORP.

                                            By:      ___________________________

                                            Its:     ___________________________

                                       7
<PAGE>

<TABLE>
<CAPTION>

                                           SCHEDULE 4D - CAPITALIZATION1
                                           ----------------------------

                                              Percent of Total
      Holder    Total Capital Contributions   Company Interest        Type of Company Interest
      ------    ---------------------------   ----------------        ------------------------
<S>                     <C>                        <C>                    <C>              <C>
        LZ              $ 7,000,000                57.7%                      Preferred
       HTI              $ 5,125,000                42.3%           Common (33%), Preferred (9.3%)
                ---------------------------   ----------------
      TOTAL             $12,125,000                 100%

</TABLE>

--------
  1 This  Schedule  4D does not  reflect the  potential  dilutive  effect of the
exercise of the LZ Investment  Option,  the First Warrant or the Second  Warrant
pursuant to the terms of this Agreement.

                                       8Exhibit 10.4

            The security  represented by this certificate was originally  issued
            on  October  16,  2000,  and  has  not  been  registered  under  the
            Securities Act of 1933, as amended. The transfer of such security is
            subject to the conditions  specified in the LLC Interest and Warrant
            Purchase  Agreement,  dated as of October  16,  2000 (as amended and
            modified  from  time  to  time),  between  the  issuer  hereof  (the
            "Company") and certain  investors and the Company reserves the right
            to refuse the transfer of such security until such  conditions  have
            been fulfilled with respect to such transfer.  Upon written request,
            a copy of such  conditions  shall be furnished by the Company to the
            holder hereof without charge.

                             ZECAL TECHNOLOGY, LLC

                                    WARRANT

Date of Issuance: October 16, 2000                           Certificate No. W-1

            FOR VALUE  RECEIVED,  Zecal  Technology,  LLC,  a  Delaware  limited
liability  company (the  "Company"),  hereby  grants to LZ Partners,  LLC or its
registered  assigns (the  "Registered  Holder")  the right to purchase  from the
Company  $3,000,000 of Preferred Company Interests of the Company.  This Warrant
is  issued  pursuant  to the  terms of the LLC  Interest  and  Warrant  Purchase
Agreement, dated as of October 16, 2000 (the "Purchase Agreement"),  between the
Company and certain  investors.  Capitalized  terms used in this Warrant but not
defined herein shall have the meanings set forth in the Purchase Agreement.

            This Warrant is subject to the following provisions:

            Section 1.  Exercise of Warrant.
                        -------------------

            1A. Exercise Period. The Registered Holder may exercise, in whole or
in part,  the purchase  rights  represented by this Warrant at any time and from
time to time after the Date of Issuance to and  including  October 15, 2005 (the
"Exercise Period").  The Company shall give the Registered Holder written notice
of the  expiration of the Exercise  Period at least 30 days but not more than 90
days prior to the end of the Exercise Period.

<PAGE>

            1B.   Exercise Procedure.
                  ------------------

             (i) This Warrant  shall be deemed to have been  exercised  when the
      Company has received all of the following items (the "Exercise Time"):

            (a) a completed  Exercise  Agreement,  as  described in paragraph 1C
      below,  executed  by the  Person  exercising  all or part of the  purchase
      rights represented by this Warrant (the "Purchaser");

            (b)   this Warrant;

            (c) if this Warrant is not  registered in the name of the Purchaser,
      an  Assignment or  Assignments  in the form set forth in Exhibit II hereto
      evidencing the assignment of this Warrant to the Purchaser,  in which case
      the Registered Holder shall have complied with the provisions set forth in
      Section 3 hereof; and

            (d) either (1) a check  payable to the Company in an amount equal to
      dollar amount of the Preferred Company Interests being purchased upon such
      exercise  (the  "Aggregate  Exercise  Price"),  (2) the  surrender  to the
      Company of debt or equity  securities of the Company having a Market Price
      equal to the Aggregate  Exercise Price of the Preferred  Company Interests
      being  purchased upon such exercise or (3) a written notice to the Company
      that the  Purchaser is  exercising  the Warrant (or a portion  thereof) by
      authorizing  the  Company to  withhold  from  issuance a dollar  amount of
      Preferred  Company  Interests  issuable  upon such exercise of the Warrant
      which  when  multiplied  by the  Market  Price of such  Preferred  Company
      Interests  is equal to the  Aggregate  Exercise  Price (and such  withheld
      Preferred  Company  Interest  shall  no  longer  be  issuable  under  this
      Warrant).  "Market  Price" shall mean, as to any security,  the average of
      the closing  prices of such  security's  sales on all domestic  securities
      exchanges on which such  security may at the time be listed,  or, if there
      have been no sales on any such  exchange  on any day,  the  average of the
      highest bid and lowest  asked  prices on all such  exchanges at the end of
      such day, or, if on any day such security is not so listed, the average of
      the  representative bid and asked prices quoted in the NASDAQ System as of
      4:00 P.M.,  New York time, on such day, or, if on any day such security is
      not quoted in the NASDAQ System, the average of the highest bid and lowest
      asked  prices  on such  day in the  domestic  over-the-counter  market  as
      reported by the National  Quotation Bureau,  Incorporated,  or any similar
      successor  organization,  in each such case  averaged  over a period of 21
      days consisting of the day as of which "Market Price" is being  determined
      and the 20 consecutive  business days prior to such day;  provided that if
      such  security  is listed on any  domestic  securities  exchange  the term
      "business days" as used in this sentence means business days on which such
      exchange is open for trading.  If at any time such  security is not listed
      on any domestic  securities exchange or quoted in the NASDAQ System or the
      domestic  over-the-counter  market,  the "Market  Price" shall be the fair
      value thereof determined jointly by the Company and the Registered Holders
      of Warrants  representing  a majority of the Preferred  Company  Interests
      issuable  upon exercise of all the Warrants  then  outstanding;  provided,
      that if such  parties are unable to reach  agreement  within a  reasonable
      period of time,  such  fair  value  shall be  determined  by an  appraiser
      jointly  selected by the Company  and the  Registered  Holders of Warrants
      representing a majority of the Preferred Company  Interests  issuable upon
      exercise of all the Warrants then  outstanding.  The determination of such
      appraiser  shall be final and binding on the  Company  and the  Registered
      Holders of the Warrants, and the fees and expenses of such appraiser shall
      be paid by the Company.

                                       2
<PAGE>

            (ii) A schedule,  certified  by an officer of the  Company,  setting
forth the fully diluted  capitalization of the Company following the exercise of
some or all or the rights  hereunder  shall be  delivered  by the Company to the
Purchaser within five business days after the date of the Exercise Time.  Unless
this Warrant has expired or all of the purchase rights  represented  hereby have
been exercised, the Company shall prepare a new Warrant, substantially identical
hereto,  representing the rights formerly represented by this Warrant which have
not expired or been exercised and shall,  within such five-day  period,  deliver
such  new  Warrant  to the  Person  designated  for  delivery  in  the  Exercise
Agreement.

           (iii) The issuance of Preferred  Company  Interests  upon exercise of
this  Warrant  shall be made  without  charge  to the  Registered  Holder or the
Purchaser for any issuance tax in respect  thereof or other cost incurred by the
Company in connection  with such exercise and the related  issuance of Preferred
Company  Interests.  All Preferred Company  Interests  issuable upon exercise of
this Warrant shall,  upon payment of the exercise price therefor,  be fully paid
and  nonassessable  and free from all  liens and  charges  with  respect  to the
issuance thereof.

            (iv) The Company  shall not close its books  against the transfer of
this Warrant or of any Preferred  Company  Interests issued or issuable upon the
exercise of this Warrant in any manner which interferes with the timely exercise
of this Warrant.

             (v) The Company  shall  assist and  cooperate  with any  Registered
Holder or  Purchaser  required  to make any  governmental  filings or obtain any
governmental  approvals  prior to or in  connection  with any  exercise  of this
Warrant (including,  without limitation,  making any filings required to be made
by the Company).

            (vi)  Notwithstanding  any other provision hereof, if an exercise of
any portion of this Warrant is to be made in connection with a registered public
offering or the sale of the Company, the exercise of any portion of this Warrant
may, at the election of the holder hereof,  be conditioned upon the consummation
of the public  offering or sale of the Company in which case such exercise shall
not be deemed to be effective until the consummation of such transaction.

                                       3
<PAGE>

           (vii) The Company  shall take all such actions as may be necessary to
assure  that all  Preferred  Company  Interests  purchased  hereunder  may be so
purchased without violation of any applicable law or governmental regulation.

          (viii)  If the  Preferred  Company  Interests  issuable  by  reason of
exercise of this  Warrant are  convertible  into or  exchangeable  for any other
stock or  securities  of the  Company,  the  Company  shall,  at the  exercising
holder's  option and upon  surrender  of this Warrant by such holder as provided
above  together  with any notice,  statement or payment  required to effect such
conversion or exchange of Preferred  Company  Interests,  deliver to such holder
(or as  otherwise  specified  by such  holder)  a  certificate  or  certificates
representing  the stock or securities  into which  Preferred  Company  Interests
issuable  by  reason  of  such  conversion  are  convertible  or   exchangeable,
registered in such name or names and in such  denomination or  denominations  as
such holder has specified.

            1C.  Exercise  Agreement.  Upon any  exercise of this  Warrant,  the
Exercise  Agreement  shall be  substantially  in the form set forth in Exhibit I
hereto,  except that if the Preferred  Company Interests are not to be issued in
the name of the Person in whose name this  Warrant is  registered,  the Exercise
Agreement  shall  also state the name of the Person  purchasing  such  Preferred
Company  Interests,  and, unless this Warrant has expired or all of the purchase
rights represented  hereby have been exercised,  it shall also state the name of
the  Person to whom a new  Warrant  for the  unexercised  portion  of the rights
hereunder is to be delivered.  Such Exercise Agreement shall be dated the actual
date of execution thereof.

            Section 2. No Voting  Rights;  Limitations  of Liability.  Until the
exercise  of the rights  hereunder,  this  Warrant  shall not entitle the holder
hereof to any voting rights or other rights as a holder of Company Interests. No
provision hereof, in the absence of affirmative  action by the Registered Holder
to purchase Preferred Company Interests, and no enumeration herein of the rights
or privileges of the Registered Holder, shall give rise to any liability of such
holder for the exercise price of the Preferred Company  Interests  acquirable by
exercise hereof or as a member of the Company.

            Section 3. Warrant Transferable.  Subject to the transfer conditions
referred to in the legend endorsed hereon, this Warrant and all rights hereunder
are transferable,  in whole or in part, without charge to the Registered Holder,
upon surrender of this Warrant with a properly executed  Assignment (in the form
of Exhibit II hereto) at the principal office of the Company.

            Section 4. Warrant  Exchangeable for Different  Denominations.  This
Warrant is exchangeable,  upon the surrender hereof by the Registered  Holder at
the principal office of the Company, for new Warrants of like tenor representing
in the aggregate the purchase  rights  hereunder,  and each of such new Warrants
shall  represent  such portion of such rights as is designated by the Registered
Holder at the time of such surrender. The date the Company initially issues this
Warrant  shall be deemed to be the "Date of Issuance"  hereof  regardless of the
number of times new  certificates  representing  the unexpired  and  unexercised
rights  formerly  represented  by this  Warrant  shall be issued.  All  Warrants
representing  portions  of the rights  hereunder  are  referred to herein as the
"Warrants."

                                       4
<PAGE>

            Section  5.  Replacement.   Upon  receipt  of  evidence   reasonably
satisfactory  to the Company (an  affidavit  of the  Registered  Holder shall be
satisfactory) of the ownership and the loss, theft, destruction or mutilation of
any certificate evidencing this Warrant, and in the case of any such loss, theft
or destruction, upon receipt of indemnity reasonably satisfactory to the Company
(provided that if the holder is a financial  institution or other  institutional
investor its own agreement shall be  satisfactory),  or, in the case of any such
mutilation  upon  surrender  of such  certificate,  the  Company  shall  (at its
expense)  execute and deliver in lieu of such  certificate a new  certificate of
like  kind  representing  the same  rights  represented  by such  lost,  stolen,
destroyed  or  mutilated  certificate  and dated the date of such lost,  stolen,
destroyed or mutilated certificate.

            Section 6. Notices.  Except as otherwise  expressly provided herein,
all  notices  referred  to in this  Warrant  shall be in  writing  and  shall be
delivered  personally,  sent by reputable  overnight  courier  service  (charges
prepaid) or sent by  registered or certified  mail,  return  receipt  requested,
postage  prepaid and shall be deemed to have been given when so delivered,  sent
or deposited in the U.S.  Mail (i) to the Company,  at its  principal  executive
offices and (ii) to the  Registered  Holder of this  Warrant,  at such  holder's
address as it appears in the records of the Company (unless otherwise  indicated
by any such holder).

            Section  7.  Amendment  and  Waiver.  Except as  otherwise  provided
herein,  the  provisions of the Warrants may be amended and the Company may take
any action herein  prohibited,  or omit to perform any act herein required to be
performed  by it, only if the Company has  obtained  the written  consent of the
Registered Holders of Warrants  representing a majority of the Preferred Company
Interests obtainable upon exercise of the Warrants.

            Section 8.  Descriptive  Headings;  Governing  Law. The  descriptive
headings of the several Sections and paragraphs of this Warrant are inserted for
convenience  only and do not  constitute  a part of this  Warrant.  The  limited
liability  company  laws of the  State  of  Delaware  shall  govern  all  issues
concerning  the  relative  rights  of the  Company  and its  members.  All other
questions concerning the construction,  validity, enforcement and interpretation
of this Warrant  shall be governed by the internal law of the State of Delaware,
without  giving effect to any choice of law or conflict of law provision or rule
(whether of the State of Delaware or any other  jurisdictions)  that would cause
the  application  of the  laws of any  jurisdictions  other  than  the  State of
Delaware.

                             *     *     *     *

                                       5
<PAGE>

            IN WITNESS WHEREOF, the Company has caused this Warrant to be signed
and  attested  by its  duly  authorized  officers  and to be  dated  the Date of
Issuance hereof.

                                       ZECAL TECHNOLOGY, LLC

                                       By ____________________________

                                       Its____________________________

Attest:

----------------------------

<PAGE>

                                                                       EXHIBIT I

                              EXERCISE AGREEMENT

To:                                       Dated:

            The  undersigned,  pursuant  to  the  provisions  set  forth  in the
attached Warrant  (Certificate  No. W-____),  hereby agrees to subscribe for the
purchase of $______ of Preferred  Company  Interests covered by such Warrant and
makes payment herewith in full therefor at the price provided by such Warrant.

                                       Signature ____________________

                                       Address ______________________

                                                                    EXHIBIT II

                                  ASSIGNMENT

            FOR  VALUE  RECEIVED,  _____________________________  hereby  sells,
assigns and  transfers all of the rights of the  undersigned  under the attached
Warrant  (Certificate  No.  W-_____)  with  respect  to  the  Preferred  Company
Interests covered thereby set forth below, unto:

Names of Assignee                Address                       Dollar Value

Dated:                                 Signature   _______________________

                                                   -----------------------

                                       Witness     _______________________

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