What is the difference?

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