Fri, 27 Mar 2020 12:13:39 +0100 wenzelm clarified signature: more accurate session_base_info.sessions_structure;
Fri, 27 Mar 2020 12:03:20 +0100 wenzelm clarified signature;
Fri, 27 Mar 2020 12:28:05 +0100 nipkow added lemma
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