本合同以英语和俄语的形式分别出具两份正本，每一个版本由卖方和买方各保存一份。

This Contract is made in English and Russian languages in two originals, one of each versions shall be for the Seller and one for the Buyer.

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技术手册、法律合同和公司网站常常包含在不同版本中重复出现的文本。

Technical manuals, legal contracts, and corporate Web sites usually contain text that is repeated in every published version.

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该合同属于转换计划的一部分，此计划目的是将4个单座l - 159重建成双座训练机版本。

The contract is part of a conversion program aimed at rebuilding four single-seat L-159s into two-seat trainer versions.

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