Mon, 14 Jul 2008 11:19:42 +0200 wenzelm command 'redo' no longer available;
Mon, 14 Jul 2008 11:19:41 +0200 wenzelm replaced obsolete ProofHistory by ProofNode (backtracking only);
Mon, 14 Jul 2008 11:19:40 +0200 wenzelm removed obsolete 'redo' command;
Mon, 14 Jul 2008 11:19:39 +0200 wenzelm removed obsolete history commands;
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