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+21 into 19 best min fragment found: 13/2
+ Cut up 21 sticks of length 19 like this:
+ 3 x (9 + 10)
+ 6 x (17/2 + 21/2)
+ 3 x (8 + 11)
+ 3 x (7 + 12)
+ 6 x (13/2 + 25/2)
+ Reassemble as 19 sticks of length 21 like this:
+ 3 x (21/2 + 21/2)
+ 3 x (10 + 11)
+ 3 x (9 + 12)
+ 6 x (17/2 + 25/2)
+ 1 x (7 + 7 + 7)
+ 3 x (13/2 + 13/2 + 8)