Sat, 06 Nov 2021 10:39:47 +0100 wenzelm clarified physical_ref;
Sat, 06 Nov 2021 10:11:25 +0100 wenzelm proper treatment of session build hierarchy;
Sat, 06 Nov 2021 00:13:29 +0100 wenzelm proper used_theories for session build hierarchy, not known_theories from imported sessions;
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