Can someone please help me with this problem?

Can someone please help me with this problem?

Give the missing reasons in this proof of the Alternate Interior Angles Theorem.

Given: L is parallel to n.
Prove: angle 4 ≅ angle 6

  1. L is parallel to n 1. Given
  2. angle 2 ≅ angle 6 a. ???
  3. angle 4 ≅ angle 2 b. ???
  4. angle 6 ≅ angle 4 c. ???

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