Ah, clever, clever grasshopper you have posed a precocious koan,
have you not? For if koans have only four letters, unless of
course, there are more than one koan which makes then koan a five
letter word, yet a koan is a koan and only four letter in a koan
and as much as we wonder what the sound of one hand clapping might
be or if a dog has Buddha nature or not, now we must wonder what is
a five letter for Zen riddles. Very clever indeed, grasshopper.