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Yajilin (Battleships) (853)
Instruction:
Locate the indicated fleet in the grid. Each piece of a ship occupies a single cell. A cell that does not contain a ship piece is considered “sea”. Ships can be rotated. Ships do not touch each other, not even diagonally (that is, if two ship pieces are in adjacent cells, they must be part of the same ship). Some cells are outlined and in gray and cannot be occupied by ships. Numbered arrows in such cells indicate the total number of cells occupied with a ship piece along the direction of the arrow, starting in the arrowed cell and going along a row or column to the edge of the grid.
Then, draw a single closed loop (without intersections or crossings) through all remaining white cells (not including outlined gray cells). Loop paths must be orthogonal.