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Bangalore Mirror (208)
Instruction:
Place mirrors in the grid, at most one per thick-outlined region such that no two cells containing mirrors touch each other, even diagonally. Lasers enter the grid from each marked row/column and turn 90-deg at mirrors and finally exit the grid. Some entry- exit pairs of lasers are marked by alphabets. If there are multiple pairs of the same alphabet, it is part of solving to identify the right pairs.