Wed, 28 Dec 2011 10:48:39 +0100 huffman simplify proof
Wed, 28 Dec 2011 10:30:43 +0100 huffman replace 'lemmas' with explicit 'lemma'
Wed, 28 Dec 2011 07:58:17 +0100 huffman add section headings
Tue, 27 Dec 2011 18:26:15 +0100 huffman remove duplicate lemma lists
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