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Many people in this thread miss crucial information already given in the OP's text!
(apart from reading the explicit example code given) > - order needs not to be preserved > - occur only once in a given line. > - They cannot be consecutive (meaning there is no sequence in a dataset). I.e. tuples like (3,1, ...), (1,1,...) or (1,2, ...) are impossible. (see OPs if condition) But the OP's format is obviously highly redundant, he's not only
Alone the last point leaves sufficient room for compression Roboticus and I already elaborated this explicitly by demonstrating all possible independent tuples and pointing to their near optimal compression using Huffman coding.
Cheers Rolf
In reply to Re^2: Data compression by 50% + : is it possible?
by LanX
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