Mon, 01 Jan 2018 16:06:37 +0100 wenzelm tuned signature;
Mon, 01 Jan 2018 16:06:30 +0100 wenzelm tuned;
Sun, 31 Dec 2017 21:42:20 +0000 paulson Restored correct spacing for set comprehensions
Sat, 30 Dec 2017 22:37:07 +0100 wenzelm less redundant;
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