[a] -> [e:1.0] -> [f:2.0] -> [g:3.0] -> [i:4.0]
[e] -> [f:6.0] -> [i:7.0]
[f] -> [i:8.0]
[g] -> [b:5.0]
[i]
[b]
[c2] -> [h:9.0]
[h] -> [d:10.0]
[d]