9 into 4: min fragment 7/4   [v1-66-g4e22cc3]
  Cut up 9 sticks of length 4 like this:
    8 x (9/4 + 7/4)
    1 x (2 + 2)
  Reassemble as 4 sticks of length 9 like this:
    2 x (9/4 + 9/4 + 9/4 + 9/4)
    2 x (2 + 7/4 + 7/4 + 7/4 + 7/4)