Triangles L O N and L M N share common side L N. Angles O L N and N L M are congruent.
What additional information would be needed to prove that the triangles are congruent using the ASA congruence theorem?

ON ≅ MN
∠LON ≅ ∠LMN
LN ≅ NM
∠LNO ≅ ∠LNM