Question: (b) The Double SAT problem asks whether a given satisfiability problem has at least two different satisfying assignments. For example, the problem {{v1, v2}, {v1,

(b) The Double SAT problem asks whether a given satisfiability problem has at least two different satisfying assignments. For example, the problem {{v1, v2}, {v1, v2}, {v1, v2}} issatisfiable,buthasonlyonesolution(v1 =F,v2 =T). Incontrast,{{v1,v2},{v1,v2}} has exactly two solutions. Show that Double-SAT is NP-hard

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