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.