Fri, 29 Dec 2006 17:24:45 +0100 wenzelm Sorts.minimal_classes;
Fri, 29 Dec 2006 17:24:44 +0100 wenzelm classes: more direct way to achieve topological sorting;
Fri, 29 Dec 2006 17:24:43 +0100 wenzelm replaced classes by all_classes (topologically sorted);
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