900 0 [1,2,3,4,5,6,7,8,9] 1 1000 1 800 200 [2,3,4,5,6,7,8,9] 1 800 0 700 150 [3,4,5,6,7,8,9] 1 800 1 600 300 [4,5,6,7,8,9] 1 600 0 400 200 [6,7,8,9] 1 500 1 200 100 [8,9] 1 300 1 200 100 [8,9] 1 200 0