Compression idea

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I have a idea for compression tho i cant make it work(as yet).
the idea is to build a dictonary) and
index to it with X,Y where
X is the start of the fragment
Y is the length of it
X is 2/3/4 bytes (varries with file) half bytes wold work too
Y is 1/2/3 bytes                     "
so that a compressed file looks like
(byte setup)(dictonary)(xy)(xy)(xy)(xy)
I can not find a good way to build the diconary
Anyone know how to do this???

PS:Has this been done by someone else??

J Reeves
Grape Vine
ICQ# 13728824

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