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Geometric axioms in junior high school mathematics
Axiom 1: If two points on a straight line are in a plane, then all points on this straight line are in this plane.

Axiom 2: If two planes have a common point, then they have other common points, and the set of all these common points is

A straight line through this common point.

Axiom 3: After passing through three points that are not on the same straight line, there is one and only one plane.

Inference 1: Through a straight line and a point outside this straight line, there is one and only one plane.

Inference 2: Through two intersecting straight lines, there is one and only one plane.

Inference 3: After passing through two parallel straight lines, there is only one plane.