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+20 into 19 best min fragment found: 13/2
+ Cut up 20 sticks of length 19 like this:
+ 2 x (19/2 + 19/2)
+ 2 x (9 + 10)
+ 4 x (17/2 + 21/2)
+ 2 x (8 + 11)
+ 4 x (15/2 + 23/2)
+ 2 x (7 + 12)
+ 4 x (13/2 + 25/2)
+ Reassemble as 19 sticks of length 20 like this:
+ 1 x (10 + 10)
+ 4 x (19/2 + 21/2)
+ 2 x (9 + 11)
+ 4 x (17/2 + 23/2)
+ 2 x (8 + 12)
+ 4 x (15/2 + 25/2)
+ 2 x (13/2 + 13/2 + 7)