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Yajisan Kazusan (341)

Instruction:
Shade some cells so that all unshaded numbered arrow clues indicate the exact number of shaded cells in the given direction. Arrows point beyond hollow areas. Shaded cells cannot touch each other by a side, and all white cells must form a single connected area. The numbered arrow clue cells can be shaded, and a clue once shaded may or may not be true.

Reference: WPC 2017 (11)