Document:

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                                                                   EXHIBIT 10-13

November 3, 2004

Ilene Kaminsky
290-174 Avenue
#1601
Miami Beach, FL 33160

Dear Ms. Kaminsky,

Epixtar Corp. and its subsidiary, Voxx Corporation (EPIXTAR), is pleased to
extend an offer to join our firm in the position of Chief Executive Officer.
This position reports directly to the board of directors. You will be nominated
to the board of directors and if elected, will likely be asked to serve as its
chairperson. We welcome you to join us on November 29, 2004. This letter will
serve to confirm our understanding of your acceptance of this position.

COMPENSATION
You will be compensated at the rate of $300,000 annually, subject to all
withholdings required by law. In addition, you will receive a $2,500 per month
automobile allowance.

The first 60 days of your employment will be probationary. After your
probationary 60 days and a performance evaluation, your status will be
regularized. If after the probationary period, EPIXTAR terminates your
employment without cause, you will receive 6 months salary. This may be paid in
one lump sum or paid out over the six months, solely at Epixtar's discretion.

In the event of a change of control in Epixtar Corp. (parent company) and or
Voxx Corporation (call center subsidiary) resulting in a valuation of either
entity of $50,000,000 or more, you will have the option to either continue your
employment at the pleasure of the new control party(s), or receive a onetime
severance of $1,000,000. Should the valuation, as a result of the above
mentioned control change, be less than $50,000,000, the said severance will be
adjusted downward on a pro rata basis.

RESPONSIBILITIES
Your responsibilities will consist of, but not be limited to: overall management
and direction of company functions including operations, marketing, strategy,
financing, creation of company culture, human resources, compliance with
regulatory issues, sales, IT and public relations. You will be responsible for
investor and board relations, vendor relations, client relations and employee
relations. You will participate with senior management in setting strategy and
vision for the direction of the Company. Capital allocation is also a major
function of your role, to include setting budgets and managing major
expenditures. Approximately 50 percent of your time will include travel both
domestically and internationally.

POLICIES AND BENEFITS
Any questions regarding EPIXTAR's policies, benefits administration or
eligibility, should be directed to Kirsten Fisch, Human Resources Director.
EPIXTAR does contract for health insurance for its employees and their immediate
family. The Company pays 80% of the premium and the employee is responsible for
the remaining 20%.

AT-WILL EMPLOYMENT
If you choose to accept this offer, please understand that the corporate office
is based in Miami, Florida, and your employment is "at-will," voluntarily
entered into and is for no specific period. As a result, you are free to resign
at any time, for any reason or for no reason. Similarly, EPIXTAR is free to
conclude its at-will employment relationship with you at any time, with our
without cause and for any reason or for no reason. Nothing herein is to be
construed to the contrary.

CONFIDENTIALITY AND AUTHORIZATION TO WORK
As a condition of employment, you will be requested to sign an Employment
Agreement, as well as other standard employment documents. You should also note
that you would be required to show proof of citizenship, permanent residency in
the U.S., or authorization to work in the U.S. within three business days of
your date of hire.

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ACCEPTANCE
To indicate your acceptance of this offer, please sign below. This offer shall
remain open until November 15, 2004. This letter supersedes any prior
communications, if any, on the subjects herein. This letter may only be modified
by a written agreement signed by you and an officer of EPIXTAR. It is not a
contract of any kind.

Welcome to EPIXTAR, Ilene Kaminsky. We hope you agree that you have a great
contribution to make to the industry by way of EPIXTAR, and that you will find
working here a rewarding experience. We look forward to the opportunity of
working with you to recreate a successful company, and we are confident that
your employment with EPIXTAR will prove mutually beneficial.

/s/ Kirsten Fisch
Kirsten Fisch
Human Resource Director
Epixtar Corp.

I ACCEPT THIS OFFER OF AT-WILL EMPLOYMENT.

/s/ Ilene Kaminsky
Ilene Kaminsky                                                         DateExhibit 10

Exhibit 10.2 (ii)

[Translated from Hebrew]

S T A T E    O F    I S R A E L

MINISTRY OF NATIONAL INFRASTRUCTURES

 

Petroleum Unit

1 Nissan 5765

10 April 2005

Petroleum 2005-96

Mr. E. Roih

Zion Oil & Gas, Inc.

Yair Stern St.

Herzelia 46412

 

Dear Sir,

Re:Extension of Term of License 298/"Ma'anit-Joseph"

Your letter of 7 April 2005

Further to your request in the above-referenced letter, I hereby extend the term of License 298/"Ma'anit-Joseph" for an additional two years, i.e. through 30 April 2007.

During the period of the extension the company shall deepen the Ma'anit #1 well at least to the Mobilla formation and will perform the required tests. Not later than 4 months after the completion of the drilling, the company shall present a plan satisfactory to the Commissioner for the continuation of exploration in the License area.

 

Very truly yours,

/s/ - Ya'acov Minran

Dr. Ya'acov Mimran

Commissioner of Petroleum AffairsZION

 

Exhibit 10.2(iii)

Soltero Employment Agreement Amendment

                                                      John Brown

Zion Oil & Gas                                                            Chairman

 

 

October 15, 2004

 

Mr. Eugene A. Soltero

Zion Oil & Gas, Inc.

6510 Abrams Road, Suite 300

Dallas, Texas 75231

Dear Gene,

Further to your appointment at the Annual Meeting of the Board of Directors on September 28, 2004 as Chief Executive Officer of the company, I take pleasure in confirming that, in that connection and pursuant to section 3 of the Personal Employment Agreement between you and the company dated as of January 1, 2004 (the "Personal Employment Agreement"), the Board has resolved to increase your Base Salary to US $20,833 per month (US $250,000 annually) commencing October 1, 2004 and continuing for such period of time as you shall serve as Chief Executive Officer of the company, subject to the provisions of the Personal Employment Agreement.

As Chief Executive Officer you shall perform the duties, undertake the responsibilities and exercise the authority customarily performed, undertaken and exercised by persons situated in a similar capacity in accordance with the provisions of the Certificate of Incorporation and Bylaws of the company and shall be under the direct supervision of, and comply with the directives of the Board.

 

Sincerely yours,

 

/s/John M. Brown

John M. Brown,

ChairmanZION

 

Exhibit 10.3(iv)

Rappaport Loan Amendment

   Zion                                                   Eugene Soltero

Oil & Gas                                                                President and Chief Executive Officer

December  9, 2004

Ms. Irith Rappaport

255A Dizengoff Street #18

Tel-Aviv 63117

Israel

Re:Loan Agreement, dated 25 February 2003 -- Extension of Credit Termination Date

Dear Irith,

Further to that certain Loan Agreement, made effective 25th February 2003, between yourself and Zion Oil & Gas, Inc. ("Zion") (the "Loan Agreement") and the Non-Negotiable Promissory Note, dated February 25, 2003 issued by Zion to you pursuant to the Loan Agreement (the "Note"), this letter confirms our agreement to amend clause (ii) of the definition of the Credit Termination Date as appears at section 1(f) of the Loan Agreement and as adopted by the provisions of the Note to "June 30, 2005" from the date currently provided thereat.

Other than as above provided, the terms of the Loan Agreement and the Note shall continue in full force and effect.

Subject to approval by our board of directors, you will further have the option to convert the Note at any time and amount in increments of $5,000 into units (at $5,000 per unit) consisting of 1,250 shares of common stock and warrants to purchase 500 shares of common stock at $5.00 per share, expiring December 31, 2004.

Your understanding and cooperation in this matter is much appreciated.

 

Very truly yours,

Zion Oil & Gas, Inc.

/s/ E A Soltero

Eugene A. Soltero

President

Acknowledged and agreed

 

/s/ Irith Rappaport

Irith Rappaport

Date: 15 Dec 2004Exhibit 4.1

                           CONVERTIBLE PROMISSORY NOTE

$1,000,000                                                      August 12, 2004

      FOR VALUE RECEIVED, LEXICON UNITED INCORPORATED, a Delaware corporation
(the "Maker"), unconditionally promises to pay to the order of KEYANO
CORPORATION, having an address at __________________________ (the "Payee"), the
principal sum of One Million Dollars ($1,000,000), at a simple interest rate of
five percent (5%) per annum computed on the basis of a 360 day year. The Maker
further agrees to pay all costs of collection, including reasonable attorneys'
fees, incurred by the Payee or by any other holder of this Promissory Note (this
"Note") in any action to collect this Note, whether or not suit is brought.

      Principal and accrued interest shall be payable on August 12, 2007. Maker
shall have the right at any time to prepay, in whole or in part, the principal
and accrued interest without penalty upon fifteen (15) days prior written notice
to the Payee.

      The amounts due hereunder are payable without deduction or offset in
lawful money of the United States of America in immediately available funds to
the Payee at its address as set forth above, or at such other place as the
holder of this Note shall from time to time designate.

            It shall be an event of default ("Event of Default"), and the then
unpaid portion of this Note shall become immediately due and payable, at the
election of Payee, upon the occurrence of any of the following events:

      (a) any failure on the part of Maker to make any payment hereunder when
due, whether by acceleration or otherwise;

      (b) Maker shall commence (or take any action for the purpose of
commencing) any proceeding under any bankruptcy, reorganization, arrangement,
readjustment of debt, moratorium or similar law or statute; or

      (c) a proceeding shall be commenced against Maker under any bankruptcy,
reorganization, arrangement, readjustment of debt, moratorium or similar law or
statute and relief is ordered against Maker, or the proceeding is controverted
but is not dismissed within sixty (60) days after the commencement thereof.

      The principal balance of this Note and all accrued interest hereunder
shall be convertible, in whole or in part, into shares of the Maker's common
stock in the manner described below at the option of the Payee or other holder
hereof at any time prior to maturity upon ten (10) days advance written notice
to the Maker. The number of shares of the Maker's common stock issuable upon
such conversion shall be equal to the quotient obtained by dividing the
principal amount hereunder and accrued interest thereon by $0.25. Upon
conversion, this Note shall be canceled and a replacement note on identical
terms shall be promptly issued by the maker to the holder hereof to evidence the
remaining outstanding principal amount hereof as of the date of the conversion,
if applicable. In the event of a stock-split, combination, stock dividend,
recapitalization of the Maker or similar event, the $0.25 conversion price and
number of shares issuable upon conversion shall be equitably adjusted to reflect
the occurrence of such event in a manner reasonably satisfactory to the holder.

      No failure on the part of the Payee or any other holder of this Note to
exercise and no delay in exercising any right, remedy or power hereunder or
under any other document or agreement executed in connection herewith shall
operate as a waiver thereof, nor shall any single or partial exercise by the
Payee or any other holder of this Note of any right, remedy or power hereunder
preclude any other or future exercise of any other right, remedy or power.

      This Note shall be binding upon the Maker and the Maker's successors and
assigns.

      This Note shall be governed by and construed in accordance with the laws
of the State of New York, excluding the conflicts of laws principles thererof.

<PAGE>

         In the event that any one or more of the provisions of this Note shall
for any reason be held to be invalid, illegal or unenforceable, in whole or in
part, or in any respect, or in the event that any one or more of the provisions
of this Note shall operate, or would prospectively operate, to invalidate this
Note, then, and in any such event, such provision or provisions only shall be
deemed null and void and of no force or effect and shall not affect any other
provision of this Note, and the remaining provisions of this Note shall remain
operative and in full force and effect, shall be valid, legal and enforceable,
and shall in no way be affected, prejudiced or disturbed thereby.

      All agreements between Maker and Payee are hereby expressly limited so
that in no event whatsoever, whether by reason of deferment in accordance with
this Note or under any agreement or by virtue of acceleration or maturity of the
Note, or otherwise, shall the amount paid or agreed to be paid to the Payee
hereunder or to compensate Payee for damages to be suffered by reason of a late
payment hereof, exceed the maximum permissible under applicable law. If
enforcement of any provision hereof at the time performance of such provision
shall be due, shall exceed the limit of validity prescribed by law, the relevant
obligations to be fulfilled shall be deemed reduced to the limit of such
validity. This provision shall never be superseded or waived and shall control
every other provision of all agreements among Maker and Payee.

      Subject to the applicable cure periods contained herein, time is of the
essence of this Note.

      EXCEPT AS OTHERWISE SPECIFICALLY PROVIDED HEREIN, THE MAKER, AND ALL
OTHERS THAT MAY BECOME LIABLE FOR ALL OR ANY PART OF THE OBLIGATIONS EVIDENCED
BY THIS NOTE, HEREBY WAIVES PRESENTMENT, DEMAND, NOTICE OF NONPAYMENT, PROTEST
AND ALL OTHER DEMANDS AND NOTICES IN CONNECTION WITH THE DELIVERY, ACCEPTANCE,
PERFORMANCE OR ENFORCEMENT OF THIS NOTE, AND DOES HEREBY CONSENT TO ANY NUMBER
OF RENEWALS OR EXTENSIONS OF THE TIME OF PAYMENT HEREOF AND AGREE THAT ANY SUCH
RENEWALS OR EXTENSIONS MAY BE MADE WITHOUT NOTICE TO ANY SUCH PERSONS AND
WITHOUT AFFECTING THEIR LIABILITY HEREIN AND DO FURTHER CONSENT TO THE RELEASE
OF ANY PERSON LIABLE WITH RESPECT TO FAILURE TO GIVE SUCH NOTICE, (ALL WITHOUT
AFFECTING THE LIABILITY OF THE OTHER PERSONS, FIRMS, OR CORPORATIONS LIABLE FOR
THE PAYMENT OF THIS NOTE).

      TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE MAKER HEREBY
KNOWINGLY AND VOLUNTARILY WAIVES TRIAL BY JURY AND THE RIGHT THERETO IN ANY
ACTION OR PROCEEDING OF ANY KIND ARISING UNDER OR OUT OF OR OTHERWISE RELATED TO
OR CONNECTED WITH THIS NOTE OR ANY RELATED DOCUMENT.

                                       LEXICON UNITED INCORPORATED

                                       By:  /s/ Elie Saltoun
                                            ------------------
                                            Name: ELIE SALTOUN
                                            Title:CEO

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