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20
× 10
3
1
× 2
1
12
× 6
2
× 2
1
× 2
1
9
× 2
2
× 2
1
1
8
× 4
2
× 2
1
0
6
× 2
2
× 2
1
0
5
2
× 2
1
0
4
2
1
0
3
× 5
2
1
0
3
× 4
2
1
0
3
× 2
1
× 3
1
0
3
× 2
1
× 2
1
0
3
1
× 2
1
-1
3
1
× 2
1