If you haven't any File , you can download this files :

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0 1 | - A B + C D + E F 1 2 3 4 | - A + B + C D E

What i do here :

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1) analysing txt file
2) create node and edge from your data
3) throw away inaccessible case
4) throw away integral integration from node pairs
5) analyse left over node pairs and repeat level 4
6) merge left over node pairs
7) Highlighting start and final states

Of course, it was not easy to write this text :)