Assume that you have a knowledge base (KB) consists of the following sentences in propositional logic:

(AB) ,(D v E) , (E v F), (CD) , (C(B v D))

You would like to check whether (KB) entails (A) by using resolution.

Initially, place (KB) in Conjunctive Normal Form (CNF).

Next, use resolution to show (KB) /\ (A) is unsatisfiable.

(1) Find (KB) /\ (A) in the Conjunctive Normal Form (CNF).

(2) Use resolution to prove that (KB) /\ (A) is unsatisfiable.