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Make a 10
100
2+3
5
100
2-1
1
100
5+__=10
5
200
4+4
8
200
4-2
2
200
6+__=10
4
300
2+7
9
300
6-3
3
300
__+9=10
1
400
1+8
9
400
8-5
3
400
__+3=10
7
500
3+7
10
500
10-6
4
500
2+__=10
8