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Koburin (1224)
Instruction:
Draw a single closed loop that passes orthogonally through centers of some empty cells in the grid. The loop connects centers of orthogonally adjacent cells, makes only right-angle turns or goes straight, and does not intersect or cross itself.
Some cells will remain empty; such cells are "unused" and cannot share an edge with each other.
The grid contains some outlined gray cells that the loop cannot pass through. A number in a gray cell indicates the number of unused cells that share an edge with that gray cell.