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+20 into 13 best min fragment found: 5
+ Cut up 20 sticks of length 13 like this:
+ 4 x (32/5 + 33/5)
+ 4 x (28/5 + 37/5)
+ 4 x (27/5 + 38/5)
+ 8 x (5 + 8)
+ Reassemble as 13 sticks of length 20 like this:
+ 4 x (28/5 + 32/5 + 8)
+ 4 x (27/5 + 33/5 + 8)
+ 4 x (5 + 37/5 + 38/5)
+ 1 x (5 + 5 + 5 + 5)