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Code-Doku Joke

If a long dress is evening wear, what is a suit of armor?

Place each of the letters of EVIL SWARM 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: Tricky

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