Rules: Place a number from 1 to N into each cell of the square grid so that each number appears exactly once in each row and column, where N is the length of the square's side. Each number inside the grid represents a skyscraper of its respective height. The outside clues indicate either of two quantities - the number of skyscrapers of odd heights visible in that direction, or the number of skyscrapers of even heights visible in that direction. Smaller skyscrapers are hidden behind taller ones. Clues are unlabeled - which skyscrapers they represent has to be determined as the puzzle is solved.
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