Thu, 30 Aug 2018 17:24:43 +0200 wenzelm clarified signature;
Thu, 30 Aug 2018 14:56:04 +0200 wenzelm tuned;
Thu, 30 Aug 2018 14:48:02 +0200 wenzelm more careful treatment position: existing facts refer to interpretation command, future facts refer to themselves (see also 4270da306442);
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