TURNAROUND-
3: /7 7 7 7 7 7 7 0 0 0 0 0 0 0 3: 5 5 5 3 3 2 0 0 0 0 0 0 0 0 03: 5 5 54: 3 2 04: 1 1 1 3 3 3 (5 5 5 5 5 5 5 5)