Fri, 28 Dec 2018 16:58:27 +0100 wenzelm clarified sessions_deps, according to Isabelle/MMT usage;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 tip