1 21 into 4: min fragment 19/10 [v1-66-g4e22cc3]
2 Cut up 21 sticks of length 4 like this:
5 Reassemble as 4 sticks of length 21 like this:
6 2 x (21/10 + 21/10 + 21/10 + 21/10 + 21/10 + 21/10 + 21/10 + 21/10 + 21/10 + 21/10)
7 2 x (2 + 19/10 + 19/10 + 19/10 + 19/10 + 19/10 + 19/10 + 19/10 + 19/10 + 19/10 + 19/10)