Sun, 11 Dec 2022 13:54:16 +0100 wenzelm tuned whitespace;
Sun, 11 Dec 2022 13:46:34 +0100 wenzelm clarified signature: more general operations;
Sun, 11 Dec 2022 12:52:46 +0100 wenzelm clarified signature;
Sun, 11 Dec 2022 11:47:28 +0100 wenzelm tuned signature;
Sat, 10 Dec 2022 21:02:09 +0100 wenzelm tuned signature;
Sat, 10 Dec 2022 20:31:47 +0100 wenzelm clarified signature;
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