Argue that every propositional assertion is logically equivalent to an assertion in conjunctive normal form. $($Hint: Method $1$ is to express a given truth function as a conjunction of clauses, each of which says you are not in one of the "bad" rows. Method $2$ is to consider a given truth function $f,$ represent notf in disjunctive normal form, and then apply another negation to get a representation of $f,$ using the De Morgan laws to put it in conjunctive normal form.$)$