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single digit subtraction
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6 - 3 = ?
3
Oops!
Okay!
5 - 1 = ?
4
Oops!
Okay!
4 - 3 = ?
1
Oops!
Okay!
5 - 0 = ?
5
Oops!
Okay!
3 - 3 = ?
0
Oops!
Okay!
4 - 4 = ?
0
Oops!
Okay!
3 - 1 = ?
2
Oops!
Okay!
8 - 1 = ?
7
Oops!
Okay!
3 - 2 = ?
1
Oops!
Okay!
3 - 0 = ?
3
Oops!
Okay!
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