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If you can copy a network
without lifting your pen off the paper
without drawing any line twice
then it is traversable.
Decide which of these diagrams are traversable.
If you end up where you started when you draw a traversable diagram it is called a traversing circuit .
If you don't end up where you started when you draw a traversable diagram it is called a traversing path.
Can you give a set of criteria for determining whether a diagram is traversable by a path or a circuit or neither?