Fri, 24 Feb 2012 16:59:20 +0100 huffman avoid using Int.succ_def in proofs
Fri, 24 Feb 2012 16:55:29 +0100 huffman avoid using Int.succ or Int.pred in proofs
Fri, 24 Feb 2012 16:53:59 +0100 huffman avoid using BIT_simps in proofs;
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