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Twos -1
| 2 +4
|
2 +1
|
9 +2
|
12 +2
|
6 +2
|
| 2 +9
|
2 +6
|
2 +12
|
4 +2
|
1 +2
|
| 12 +2
|
2 +1
|
9 +2
|
2 +4
|
6 +2
|
| 4 +2
|
1 +2
|
2 +9
|
2 +12
|
2 +6
|