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Network of channels and associated multigraph . The black circles are the nodes of the multigraph and the solid lines its edges.
is in dashed lines. The arrows next to the edges that intersect indicate the flow direction. No arrow next to an edge that intersects means that there is no flow through that edge. A plausible example is shown in (a). The situation of (b) is impossible since we would have a net flow into .
The edges of are the solid lines. The dashed lines are not part of . and and are the connected components of .
The clogged edges are the thick solid lines. The open edged in thin solid lines. The thick dashed lines are the edges in . The white circles are the nodes of .
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