Sat, 27 Aug 2022 15:29:02 +0200 wenzelm tuned whitespace for presentation;
Sat, 27 Aug 2022 15:23:58 +0200 wenzelm clarified signature of Sessions.Session: chapter_defs: vs. known_chapters (in declaration order) vs. chapters (covered by visible sessions);
Sat, 27 Aug 2022 12:18:49 +0200 wenzelm clarified syntax: more uniform;
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