Think I solved it: May 15, 16, 19 -- June 17, 18 -- July 14, 16 -- August 14, 15, 17 If A knows B doesn't know it, remove months with unique dates: July 14,

Think I solved it: May 15, 16, 19 -- June 17, 18 -- July 14, 16 -- August 14, 15, 17 If A knows B doesn't know it, remove months with unique dates: July 14, 16 -- August 14, 15, 17 If B now knows it, it cannot be 14. Remove that: July 16-- August 15, 17 If A now knows it, has to be July 16.