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Sashigane (307)
Instruction:
Divide the grid into "L"-shaped regions along the grid lines. An "L"-shaped region includes one "pivot" cell and two "end" cells (all three must be distinct). Each end cell must be in the same row or column as the pivot, and all cells between the end and pivot along that row or column must be in the region. No other cells are allowed to be in the region. The two end cells cannot be in the same row or column. Some cells are marked with circles; those must be pivot cells. Some cells are marked with arrows; those must be end cells with the arrow pointing towards its pivot. Some cells have numbers in them; each such number indicates the area of its region.