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Dec 9, 2014 at 4:20 comment added xnor Nice, this means the optimal answer is one of 15, 16, or 17. Your observation about symmetry can be nicely formalized: Any solution remains a solution if you reverse the order of the conversations and flip the roles of Al and Jane.
Dec 8, 2014 at 19:55 history edited Trenin CC BY-SA 3.0
added 13 characters in body
Dec 8, 2014 at 19:50 history edited Trenin CC BY-SA 3.0
deleted 41 characters in body
Dec 8, 2014 at 19:45 comment added Joel Rondeau Can add CD ABE; GH FIJ
Dec 8, 2014 at 19:42 history answered Trenin CC BY-SA 3.0