9 into 7: min fragment 5/2   [v1-66-g4e22cc3]
  Cut up 9 sticks of length 7 like this:
    6 x (9/2 + 5/2)
    2 x (4 + 3)
    1 x (7/2 + 7/2)
  Reassemble as 7 sticks of length 9 like this:
    3 x (9/2 + 9/2)
    2 x (4 + 5/2 + 5/2)
    2 x (7/2 + 3 + 5/2)