Blacken some cells in the grid so that blackened cells do not touch each other from the sides. All remaining empty cells should be traversed by a single continuous loop, moving horizontally an vertically. Clues inside the grid indicate the numbers of blackened cells in the corresponding directions. There may exist some blackened cells that are not pointed by any arrow.
Regional yajilin:
Number clues indicate the number of blackened cells in corresponding region.
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