Tue, 27 Aug 2002 11:04:00 +0200 wenzelm dup_elim: improved error reporting;
Tue, 27 Aug 2002 11:03:05 +0200 wenzelm *** empty log message ***
Tue, 27 Aug 2002 11:03:02 +0200 wenzelm avoid duplicate fact bindings;
Tue, 27 Aug 2002 10:59:21 +0200 wenzelm * Isar: preview of problems to finish 'show' now produce an error
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