SOLUTION: 5) I can only use the 8 rules of inference.
1. C → (T → L)
2. ~L
3. ~E → C
4. L v ~E /~T
___________ ___________
5.
6.
7.
8.
9.
1. C -> (T -> L)
2. ~L
3. ~E -> C
4. L v ~E /~T
--------------------------
5. ~E 4,2 Disjunctive Syllogism
6. C 3,5 Modus Ponens
7. T -> L 1,6 Modus Ponens
8. ~T 7,2 Modus Tollens