There are only two subsets of a line in a geometry: segment and ray.
Line is an infinite set of points.
Segment is a part of a line from one point to another.
Ray starts at one point of a line and goes on indefinitely in one direction.
source: Next Century Mathematics (3rd year high school) by Mercado, Suzara and Orines. Published by Phoenix Publishing House, INc. 2003
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