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Solution to Puzzle L-12.  ICE CREAM SUNDAE

Ben, Carol, Fenny, and Harry went to a bar to have ice cream sundaes. Each of their ice cream two flavors from among the following: Chocolate, vanilla, raspberry, and strawberry.

To solve this puzzle, create a table below with Y representing flavors chosen, and X representing flavors not chosen.

Since Ben did not have chocolate,  Carol did not have vanilla,  Fenny did not have raspberry, Carol had strawberry, and Harry did not have strawberry, we have the following table:

 chocolate vanilla raspberry strawberry Ben X Carol X Y Fenny X Harry X

Since Carol and Fenny did not have any flavors in common, we have

 chocolate vanilla raspberry strawberry Ben X Carol X X Y Y Fenny Y Y X X Harry X

Two of them had strawberry, therefore we have

 chocolate vanilla raspberry strawberry Ben X Y Carol X X Y Y Fenny Y Y X X Harry X

Two of them had chocolate, therefore we have

 chocolate vanilla raspberry strawberry Ben X Y Carol X X Y Y Fenny Y Y X X Harry Y X

Three of them ordered vanilla, therefore we have

 chocolate vanilla raspberry strawberry Ben X Y X Y Carol X X Y Y Fenny Y Y X X Harry Y Y X X

Based on the table above,

Both Harry and Fenny had chocolate and vanilla.

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Bits and Beyond ...

Mistakes are at the very base of human thought, embedded there, feeding the structure like root nodules. If we were not provided with the knack for being wrong, we could never get anything useful done.  We think our way along by choosing between right and wrong alternatives, and the wrong choices have to be made as often as the right ones. We get along in life this way.

Lewis Thomas

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