7 into 4: min fragment 5/3   [v1-66-g4e22cc3]
  Cut up 7 sticks of length 4 like this:
    6 x (7/3 + 5/3)
    1 x (2 + 2)
  Reassemble as 4 sticks of length 7 like this:
    2 x (7/3 + 7/3 + 7/3)
    2 x (2 + 5/3 + 5/3 + 5/3)