What does the following means?

[cbarker1]

Dear Everybody,
What does the following means:
Two straight lines cannot have any two points of one coincide with two points of the other without the lines coinciding altogether?

I think it means that line can't overlap with itself.

Thanks,
Cbarker1

 

[MarkFL]

I take that statement to mean that no two straight lines can have two points in common without being the same line (coinciding).

 

[HOI]

In other words, in Euclidean geometry, two distinct lines are either parallel, and have no points in common, or intersect, and have exactly one point in common.