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We address the network coding problem, in which messages available to a set of sources must be passed through a network to a set of sinks with specified demands. It is known that the problem of deciding whether the demands can be met using a linear code is NP-hard [Lehman and Lehman, SODA '04]. Such a result is not known if we allow general (=non-linear) codes to be used. Despite this, network coding...
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