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Code-Doku Joke

What has one horn and gives milk?

Place each of the letters of TRIAL MUCK exactly once in each row, column and 3×3 box. 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

Here is a print-friendly version of this puzzle.

Please send responses to

Thanks,
Steve