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PPM language model
A PPM model is used in many text
compression alogirthms. The one implemented here is order 5 and uses
`escape method D'. It can compress most text to a little over 2 bits
per character. A good reference for PPM is Witten Bell Cleary -
Text Compression
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Site last modified Mon Jun 9 15:01:44 BST 2003
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