PAQAR 4.0 Codec for 7-zip Versions 3.xx to v4.28 Beta
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Copyright (C) 2004 Oleg Anashkin.


To use PAQAR 4.0 compression algorithm, extract to 7-ZIP/Codecs folder and use following command line: 
 
7z a -t7z -mf=off -m0=paqar4:o=6:a=1 %* 


To enable it with the GUI type "f=off 0=paqar4:o=6:a=1 s=on" in the parameters box of the "add" dialog while setting 
"Compression Method" to "Bzip2" (necesarry to null some arguments). 



For more information, see this thread on 7-Zip's Forum:

http://sourceforge.net/forum/forum.php?thread_id=1092453&forum_id=45797



The PAQ Data Compression Programs
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PAQ is a series of open source data compression archivers that have evolved through collaborative development to top 
rankings on several benchmarks measuring compression ratio (although at the expense of speed and memory usage).

http://www.cs.fit.edu/~mmahoney/compression/

