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