Mon, 14 Aug 2017 18:54:25 +0100 paulson further Hensock tidy-up
Mon, 14 Aug 2017 22:06:26 +0200 nipkow separate file for priority queue interface; extended Leftist_Heap.
Mon, 14 Aug 2017 16:03:24 +0200 wenzelm tuned GUI;
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