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enter image description here

As usual, I'm adding the link to the rules for those that don't know the puzzles Click me!

This one's easy

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It seems to me that

The diagrams on the left have exactly one point of intersection of degree $3$ while those on the right have either a point of intersection of degree $4$ or two points of intersection of degree $3$. Here, the degree of a point of intersection is the number of curves emerging from it in any given direction.

See the following diagram, for illustration

enter image description here

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