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Maximal Lengths (588)
Instruction:
Draw a single continuous loop that goes through orthogonally adjacent cells. It must go through each white cell exactly once and not go through any black cells. Numbers above and to the left of the grid indicate the length of the longest straight part of the loop (from the center of the first cell to the center of the last cell) in that row or column. A zero indicates that that the loop does not travel along that row or column.