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main.21.3
1
21 into 3: min fragment 3 [v1-66-g4e22cc3]
2
Cut up 21 sticks of length 3 like this:
3
21 x (3)
4
Reassemble as 3 sticks of length 21 like this:
5
3 x (3 + 3 + 3 + 3 + 3 + 3 + 3)