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Given: Line segment N M is parallel to line segment P O. and Angle 1 is-congruent-to angle 3
Prove: Line segment N M is parallel to line segment N O.

4 lines are connected. Line segment L M connects to line segment M N to form angle 1. Line segment M N connects to line segment N O to form angle 2. Line segment N O connects to line segment O P to form angle 3.

A 2-column table has 5 rows. Column 1 is labeled statements with the entries line segment N M is parallel to line segment P O, angle 2 is-congruent-to angle 3, angle 1 is-congruent-to angle 3, angle 1 is-congruent-to angle 2, line segment L M is parallel to line segment N O.

What is the missing reason in the proof?

given
transitive property
alternate interior angles theorem
converse alternate interior angles theorem