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Adjacency Loop (200)
Instruction:
Draw a loop that passes through all cells of the grid. The loop cannot cross, intersect or overlap itself. All cells that the loop passes through more than once are shaded. Each number in a cell indicates the distance between the edge through which the loop enters that cell and the edge through which the loop exits that cell. The distance is measured along the edges. In any cell with clues, the numbers cover all instances of the loop visiting that cell.