What is the difference?

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10-5 = ?10-5 = 5
10-9 = ?10-9 = 1
7-4 = ?7-4 = 3
10-6 = ?10-6 = 4
6-5 = ?6-5 = 1
7-5 = ?7-5 = 2
8-6 = ?8-6 = 2
8-1 = ?8-1 = 7
5-4 = ?5-4 = 1
5-4 = ?5-4 = 1
10-5 = ?10-5 = 5
8-4 = ?8-4 = 4
9-5 = ?9-5 = 4
10-9 = ?10-9 = 1
7-5 = ?7-5 = 2
10-4 = ?10-4 = 6
10-3 = ?10-3 = 7
10-7 = ?10-7 = 3
5-1 = ?5-1 = 4
6-3 = ?6-3 = 3
8-6 = ?8-6 = 2
8-4 = ?8-4 = 4
8-6 = ?8-6 = 2
10-7 = ?10-7 = 3
7-4 = ?7-4 = 3
9-2 = ?9-2 = 7
6-4 = ?6-4 = 2
10-1 = ?10-1 = 9
8-4 = ?8-4 = 4
9-8 = ?9-8 = 1
6-5 = ?6-5 = 1
9-5 = ?9-5 = 4
10-9 = ?10-9 = 1
10-8 = ?10-8 = 2
9-5 = ?9-5 = 4
10-4 = ?10-4 = 6
8-7 = ?8-7 = 1
8-3 = ?8-3 = 5
4-3 = ?4-3 = 1
10-9 = ?10-9 = 1
7-3 = ?7-3 = 4
10-9 = ?10-9 = 1
8-3 = ?8-3 = 5
10-7 = ?10-7 = 3
6-3 = ?6-3 = 3
10-9 = ?10-9 = 1
8-2 = ?8-2 = 6
8-4 = ?8-4 = 4
8-2 = ?8-2 = 6
9-8 = ?9-8 = 1
9-8 = ?9-8 = 1
10-1 = ?10-1 = 9
10-9 = ?10-9 = 1
10-6 = ?10-6 = 4
10-3 = ?10-3 = 7
10-7 = ?10-7 = 3
9-5 = ?9-5 = 4
9-4 = ?9-4 = 5
10-2 = ?10-2 = 8
8-4 = ?8-4 = 4
9-6 = ?9-6 = 3
7-5 = ?7-5 = 2
5-3 = ?5-3 = 2
8-1 = ?8-1 = 7
4-1 = ?4-1 = 3
7-1 = ?7-1 = 6
7-4 = ?7-4 = 3
7-6 = ?7-6 = 1
8-7 = ?8-7 = 1
4-2 = ?4-2 = 2
8-7 = ?8-7 = 1
6-4 = ?6-4 = 2
10-5 = ?10-5 = 5
8-4 = ?8-4 = 4
6-5 = ?6-5 = 1
7-4 = ?7-4 = 3
10-5 = ?10-5 = 5
6-4 = ?6-4 = 2
7-6 = ?7-6 = 1
10-5 = ?10-5 = 5
6-5 = ?6-5 = 1
10-9 = ?10-9 = 1
5-2 = ?5-2 = 3
8-7 = ?8-7 = 1
10-7 = ?10-7 = 3
10-9 = ?10-9 = 1
7-4 = ?7-4 = 3
10-6 = ?10-6 = 4
10-9 = ?10-9 = 1
9-8 = ?9-8 = 1
10-6 = ?10-6 = 4
4-1 = ?4-1 = 3
6-1 = ?6-1 = 5
9-5 = ?9-5 = 4
10-9 = ?10-9 = 1
6-3 = ?6-3 = 3
5-3 = ?5-3 = 2
8-5 = ?8-5 = 3
10-4 = ?10-4 = 6
7-3 = ?7-3 = 4