The first and third steps are multi-commodity flow problem; while the second step is the network coding problem.

第一阶段和第三阶段面临的是多商品流问题，第二阶段是网络编码问题。

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The first and third steps are multi-commodity flow problem; while the second step is the network coding problem.

第一阶段和第三阶段面临的是多商品流问题，第二阶段是网络编码问题。

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