Wed, 10 Nov 2010 13:08:42 -0800 huffman removed unused lemma chain_mono2
Wed, 10 Nov 2010 11:42:35 -0800 huffman rename class 'bifinite' to 'domain'
Wed, 10 Nov 2010 09:59:08 -0800 huffman instance sum :: (predomain, predomain) predomain
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