915
2
13
322
3
13
1885
8
13
811
0
13
721
0
13
770
0
13
1270
0
13
308
0
13
929
0
13
777
0
12
622
0
12
614
0
12
768
0
12
639
0
12
645
0
12
775
1
12
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Keyword(s): 数学a