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We have seen energy can be saved by compressing files before transmitting them over the network, but one must be mindful of the energy required to do so. Compression and decompression energy may be minimized through wise use of memory (including efficient data structures and/or sacrificing compression ratio for cacheability). One must be aware of evolving hardware's effect on overall energy. Finally, knowledge of compression and decompression energy for a given system permits the use of asymmetric compression in which the lowest energy application for compression is paired with the lowest energy application for decompression.