there should be six..........
This question cannot be answered because there is no context.
I question why you don't just search the answers of already answered questions.
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18
Two points (which must lie on a line) and the third point NOT on that line.
Both ends of the line must join together, as in a circle, loop, or a closed figure.
What must be true? In your example, we have 4 intersecting lines. g and b are parallel, and f and h are parallel. g and b are perpendicular to f and h. It might look like tic-tac toe for example
If it is a straight line it must be in the same plane. Otherwise not necessarily.