This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
How many flowers do I have if all of them are roses except two, all of
them are tulips except two, and all of them are daisies except two?
logic/flowers.s
There are two solutions:
Three flowers: rose, tulip, daisy
Two flowers: carnation, geranium
 
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