Long description
In the graph:
Node 1 is on the extreme left.
Nodes 2, 3, and 4 are to the right of node 1, one below the other.
Nodes 5, 6, 7, and 8 are to the right of nodes 2, 3, and 4, one below the other.
Nodes 9, 10, 11 and 12 are to the right of nodes 5, 6, 7, and 8, one below the other.
Nodes 13, 14, and 15 are on the right.
Node 16 is on the extreme right.
Three arcs with values 20, 15, and 18 from node 1 lead to nodes 2, 3, and 4, respectively.
Two arcs with values 10 for both from node 2 lead to nodes 5 and 6.
An arc with value 11 from node 3 leads to node 7.
An arc with value 12 from node 4 leads to node 8.
Two arcs with values 16 and 8 from node 5 lead to nodes 9 and 6, respectively.
Two arcs with values 12 for both from node 6 lead ...
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