Problem: Prove that from a contradiction (P&-P) you can prove any sentence. You only need to use the resources of first-order propositional logic and your proof will be short. [Hint: assume (P&-P) is true, your proof should use and-elimination, or-introduction, and one more derived rule. Remember, if (P&-P) is true then both conjuncts are true on their own and that VI says that if any proposition, Q, is true then Qv[any other proposition] is true].