Collinear

In this illustration, A, B, and C are all considered to be collinear. In contrast, D does not lie on the same line as the other points.

However, since any two points can be used to define a line, D is still considered to be collinear with the other points individually. Therefore, there are four sets of collinear points on the graph. {A,B,C} {A,D} {B,D} {C,D}