Wed, 31 May 2017 17:25:26 +0200 wenzelm explicit preview request/response;
Wed, 31 May 2017 11:49:29 +0200 wenzelm tuned layout;
Wed, 31 May 2017 11:43:37 +0200 wenzelm more robust -- avoid race condition wrt. Haskell output in $ISABELLE_TMP/examples/
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