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Code-Doku Joke

What lies on its back, one hundred feet in the air?

Place each of the letters of PEDANTIC exactly once in each row, column and 3×3 box. In addition to the letters, each row, column and 3×3 box will also contain one empty square. When you have completed the puzzle, the shaded squares will form the punch line of the joke read left to right, then top to bottom.

Difficulty: Fiendish

Please send responses to my email address is mathrec at this domain