Question: Let CNFk = {| is a satisfiable cnf-formula where each variable appears in at most k places}. a. Show that CNF 2 P.

Let CNFk = {〈ϕ〉| ϕ is a satisfiable cnf-formula where each variable appears in at most k places}.

a. Show that CNF2 ∈ P.

b. Show that CNF3 is NP-complete.

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