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main.21.2
1
21 into 2: min fragment 1 [v1-66-g4e22cc3]
2
Cut up 21 sticks of length 2 like this:
3
20 x (2)
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1 x (1 + 1)
5
Reassemble as 2 sticks of length 21 like this:
6
2 x (2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 1)