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These are edge labels. Each edge is described by a 3-element tuple (s,t,l) where s and t are start/end vertices, and l in a label. None means that there is no label.
| | 1 | initial version | |
These are edge labels. Each edge is described by a 3-element tuple (s,t,l) where s and t are start/end vertices, and l in a label. None means that there is no label.
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