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What do you mean by pairwise intersection?
Every two straight lines cross each other.

A * * * There are three situations.

1. 1 intersection point, four straight lines intersect at one point, also called pairwise intersection. Look at the concept

2.4 intersection point, three lines intersect at one point, and the other one intersects with these three lines.

3.6 intersection, no overlapping intersection, is what others said.

Give points, everyone has learned it in junior high school.