• 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?