Casemates: Just what is the "F" in "F.U.N." for?

F is for Friends who do stuff together.

F is for Friends who do stuff together.
F is for Frolic through all the flowers.

F is for Frolic through all the flowers.
F is for Fire that burns down the whole town.

F is for Fire that burns down the whole town.
F is for Franc, as in Cabernet Franc.

F is for Franc, as in Cabernet Franc.

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