On a plain, where every straight line between two points goes through a third point, one of the following statements must be true:
1. All points are in a line;
2. There are infinite number of points.
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On a plain, where every straight line between two points goes through a third point, one of the following statements must be true:
1. All points are in a line;
2. There are infinite number of points.
https://en.wikipedia.org/wiki/Sylvester%E2%80%93Gallai_theorem
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