Meaning of points of the same line?

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    The output for [[0,0],[1,1],[1,-1]] is 2.

    I donot understand how the output is 2. 2 points always form a line. So you need 3 points to see if they are on the same line. But, the given 3 points are not on a straight line. Does the question actually mean how many points have the same slope?

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