Sat, 28 Aug 2021 23:11:20 +0200 wenzelm more Isabelle/Haskell operations;
Sat, 28 Aug 2021 12:33:43 +0200 wenzelm clarified signature;
Fri, 27 Aug 2021 21:56:42 +0200 wenzelm more Isabelle/Haskell;
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