2102
0
21
871
0
20
2772
0
20
1153
0
20
1274
0
20
1871
0
20
555
0
20
1011
2
19
1041
0
19
2392
0
19
927
0
19
781
1
19
948
0
19
429
0
18
766
0
18
506
0
18
763
0
18
1363
0
18
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Keyword(s): 数学b