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3, 4, 10, 2 2, 7, 12, 3 0, 3, 4, 5 6, 5, 9, 11
1: 2: 3, 4 10, 2 ... 3: 4: 0, 3 4, 5 6, 5 9, 11
@matrix = ([3, 4, 10, 2], [2, 7, 12, 3], ... } print "\n"; }