Makes 
(All bullfrogs are camels, or IF something's a bullfrog, THEN it's a camel) TRUE
The only way to make this sentence true is to put all the non-empty part of the B circle completely inside the C circle. If any non-empty part of the B circle hangs out of the C circle, then it's got to be crosshatched! Otherwise isn't true!
An important thing to remember here is that the precise translation of
is "For everything in the universe, if that thing is a bullfrog, then it's also a camel." So any universe that won't let you put something inside the B circle without it also ending up in the C circle will make true.
Copyright © 2005 by Martin C. Young
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