Subtraction Within 5
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1 − 0 = 1
1 − 1 = 0
2 − 0 = 2
2 − 1 = 1
2 − 2 = 0
3 − 0 = 3
3 − 1 = 2
3 − 2 = 1
3 − 3 = 0
4 − 0 = 4