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Balance Loop (207)
Instruction:
Draw a single loop that passes orthogonally through centers of cells. The loop may not intersect itself or enter the same cell more than once.
The loop must go through all cells with a symbol or number. For each cell on the loop, consider an "arm" to be the loop segment between the center of that cell and the next or previous turn in the loop; each cell therefore has two arms. A white square in a cell indicates that its two arms are of equal length; A black circle in a cell indicates that its two arms are of unequal length. A number in a cell indicates the sum of the lengths of its two arms.