Mon, 30 Nov 2020 11:06:01 +0000 paulson tweaked
Mon, 30 Nov 2020 19:08:58 +0100 wenzelm obsolete -- done by Isabelle/PIDE/ML;
Mon, 30 Nov 2020 17:10:49 +0100 wenzelm tuned whitespace --- avoid TABs;
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