Tue, 28 Aug 2018 11:28:38 +0200 wenzelm tuned;
Tue, 28 Aug 2018 11:22:04 +0200 wenzelm tuned signature;
Tue, 28 Aug 2018 11:13:33 +0200 wenzelm clarified ML_environment: ML_write_global requires "Isabelle";
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