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Can you tell me how to prove the following?

Given a set of n distinct points in the plane such that for any two points in the set there is a third point in the set that is colinear with them (i.e., lies on the same line with them), prove that all the n in the set are colinear (i.e., lie on the same line).

Thank you

didi

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# Colinear points?

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