Question

What are the missing reasons in the two -column proof?

Given: Line MO bisects angle PMN and line OM bisects angle PON
Prove: Triangle PMO is congruent to triangle NMO

Statements/Reasons
1. Line MO bisects angle PMN/ 1.????
2. Angle PMO is congruent to angle NMO/ 2.????
3. Line NO is congruent to line NO/ 3.????
4. Line ON bisects angle PON/ 4.????
5. Angle POM is congruent to angle NOM/ 5.????
6. Triangle PMO is congruent to triangle NMO/ 6.????