Sat, 09 Jan 2010 09:38:34 +0100 Christian Urban introduced separate match function
Sat, 09 Jan 2010 08:52:06 +0100 Christian Urban removed obsolete equiv_relation and rnamed new_equiv_relation
Fri, 08 Jan 2010 19:46:22 +0100 Cezary Kaliszyk New_relations, all works again including concat examples.
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