Mon, 30 Aug 2021 21:18:49 +0200 wenzelm avoid change of existing file, notably rebuild via ghc_stack;
Mon, 30 Aug 2021 21:10:13 +0200 wenzelm tuned signature;
Sun, 29 Aug 2021 13:16:22 +0200 wenzelm more Isabelle/Haskell operations;
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