Fri, 18 Jan 2008 20:22:07 +0100 huffman change lemma admD to rule_format
Fri, 18 Jan 2008 08:30:12 +0100 haftmann improved implementation
Thu, 17 Jan 2008 21:56:33 +0100 huffman convert lemma lub_mono to rule_format
Thu, 17 Jan 2008 21:44:19 +0100 huffman rename lemma chain_mono3 -> chain_mono, chain_mono -> chain_mono_less
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