
1) Data compression
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https://www.crosswordclues.com/clue/precompressor

A precompressor is a computer program, which alters file content so that a real lossless compression program will achieve better results than without precompressing. This is possible by creating such patterns that compression programs will recognize. == Compressing already compressed files == Usually, the compression rate on files that are already...
Found on
http://en.wikipedia.org/wiki/Precompressor
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