2-1=, 3-1=, 4-1=, 5-2=, 6-2=, 7-2=, 8-3=, 9-3=, 10-3=, 11-4=, 12-4=, 13-4=, 14-5=, 15-5=, 16-5=, 17-6=, 18-6=, 19-6=, 20-7=, 21-7=, 22-7=, 23-8=, 24-8=, 25-8=, 26-9=, 27-9=, 28-9=, 29-10=, 30-10=, 31-10=, 4-2=, 5-4=, 6-3=, 8-4=, 9-5=.

Subtraction problems.

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