You are given proof sequence. Justify each step in it (meaning, write down what rule was used to derive it, and from which previously obtained step(s) if applies).

Argument is: A B [B (A C)] C

Proof sequence (you should substitute ? with your reasoning)

Step Reason

1. A ?

2. B ?

3. B (A C) ?

4. A C ?

5. (A) C ?

6. A C ?

7. C ?