1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
4
0
4
0
2020-05-15
2020-05-15
2020-05-15
2020-05-15
2020-05-15
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