Fri, 27 Mar 2015 11:38:26 +0100 wenzelm clarified goal context;
Fri, 27 Mar 2015 15:08:31 +0100 blanchet clarified doc
Fri, 27 Mar 2015 11:20:46 +0100 blanchet more graceful failure if some of the involved BNFs have no data
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