Thu, 03 Feb 1994 13:56:15 +0100 wenzelm added if_none, parents, commas, gen_duplicates, duplicates, assoc2;
Thu, 03 Feb 1994 13:55:42 +0100 wenzelm replaced pprint_sg by Sign.pprint_sg;
Thu, 03 Feb 1994 13:55:20 +0100 wenzelm replaced eq_sg by Sign.eq_sg;
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