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In Compact vs. Narrow Notation
- For nections of compact notation, we make no attempt to locate precisely the boundaries between nections, just identifying "external lines" as the loci of boundaries.
- The nections of narrow notation have a clear basis for distinguishing boundaries: a line belongs to the same nection as its source, and the boundary is the point at which it connects to its destination node, marked in the notation by an arrowhead.