In this exercise, there is one piece of unnecessary information. State what information you do not need for the proof. Then give a two-column proof that does not use that piece of information.

Given: LM is congruent to LN; KM is congruent KN; KO bisects MKN; Prove: LO bisects MLN.

This question is taken from Geometry (McDougal Littell), page 131, question 10 of Written Exercises.