Tue, 27 Dec 2011 12:27:06 +0100 huffman use 'induct arbitrary' instead of 'rule_format' attribute
Tue, 27 Dec 2011 12:05:03 +0100 huffman declare simp rules immediately, instead of using 'declare' commands
Tue, 27 Dec 2011 11:38:55 +0100 huffman declare word_of_int_{0,1} [simp], for consistency with word_of_int_bin
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