1557
1
19
667
0
19
1040
0
19
247
0
19
2693
0
19
425
0
19
998
0
19
678
0
19
745
0
19
1361
0
19
821
0
19
1873
0
19
683
0
19
957
0
19
724
0
19
655
0
19
747
0
19
489
0
19
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Keyword(s): 数学ii