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