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Skyscraper Blocks (354)
Instruction:
Place a number from 1 to X (integers only) into each cell so that each number appears exactly once in each row, and no more than once in each column. (X is the number of cells in each row.) Each number represents a skyscraper of its respective height. The numbers outside the grid indicate how many skyscrapers can be seen in the respective row or column from the respective direction; smaller skyscrapers are hidden behind higher ones. Some numbers may already be filled in for you.
The cells are separated into pairs. When the pairs are interpreted as two-digit numbers, the provided inequality signs indicate the appropriate relationship between adjacent pairs.