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Subtraction Doubles -1
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A
B
2-1=
1
3-2=
1
4-3=
1
5-4=
1
6-5=
1
7-6=
1
8-7=
1
9-8=
1
10-9=
1
11-10=
1
12-11=
1
13-12=
1
karen bauer
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