35
w2<>w1<>2 8 2
w2<>w3<>3 8 14
w2<>w4<>3 8 24
w3<>w4<>9 14 24
w5<>w3<>2 3 14
w4<>w5<>1 24 3
w4<>w6<>5 24 9
w4<>w7<>1 24 5
w4<>w8<>5 24 5
w6<>w7<>4 9 5