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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}}
is satisfiable, but has only one solution (v₁ = F, v₂ = T). In contrast, {{v₁, V2}, {V1, V2}}
has exactly two solutions. Show that Double-SAT is NP-hard.

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