Fri, 21 Sep 2018 17:48:39 +0200 wenzelm clarified errors;
Fri, 21 Sep 2018 16:47:03 +0200 wenzelm suppress some theories to allow "isabelle dump -o skip_proofs";
Fri, 21 Sep 2018 14:31:07 +0200 wenzelm tuned signature;
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