Two copies of the contract will be sent to you for signature.

合同一式两份，将送交您签署。

《牛津词典》

This contract is made four copies, each party hold two copies. The annex hereto is an integral part of this contract and being equal authentic with text hereof.

本合同一式四份，双方各执两份。本合同附件，为本合同不可分割的组成部分，与合同 正文具有同等效力。

youdao

This contract has triplicate copies, all of which have the same effect.

本合同一式三份，具有同等效力。

youdao

Much of the case has hinged on electronic documentation: emails that Ceglia claimed to have exchanged with Zuck about Facebook and electronic copies of the alleged contract that the two signed.

FORBES: Facebook Offers Court 'Smoking Gun' Against Paul Ceglia