Inspired by this standupmaths video I made some shapes and figured out whether they can be made without taking pen off the paper.
So if a shape has got all odd number of lines going from its every point you can never make it without taking your pen off.
If it has only two such odd points it's called Semi-Eulerian Graph and then you can make the shape by beginning on one odd point and ending on another, as in the very first shape of the following picture.
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