[Ref: ZUDY] © Alan Stillson and Frank Longo.
- Place letters into the grid such that every row, column, and 2x2 block has letters (in any order) that form a common word.
- Each letter is only used once, and no letter is repeated in the rows/cols/blocks.
- Letters allowed: S O N A T A.
Hint: Row 3's missing letter is T.
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