310
320
0 .........1.......................
1 ................................
1 .........1.................................
1 .........1............................................
1 .........1.................................
1 .........1...........................
1 .........1.............................................
1 .........1...........................
1 .........1..............................
2
310
320
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1 .........0...........................
1 .........0........................
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2 .........2...................................