A line has infinitely many subsets, not just three. Any collection of points on the line constitute a subset.
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No, 2 points define a line, 3 points define a plane.
{1,2,4.7} is a proper subset of {1, 2, 3, 4, 4.7, 5}
Rhombuses whose acute angles are 3 degrees would be one subset.
If you are designing a 3 dimensional coordinate system to define the robots movements then you might use these three letters to define each axis of direction (3 axes perpendicular to each other)
Depending on how you choose to define a line segment, you may conclude that the letter E has 4 or 5 line segments.