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Addition: 1s and 2s


AB
1+12
1+23
1+34
1+45
1+56
1+67
1+78
1+89
2+02
2+13
2+24
2+35
2+46
2+57
2+68
2+79
3+03
3+14
3+25
3+36
3+47
3+58
3+69
4+04
4+15
4+26
4+37
4+48
4+59