Question: (20%) Consider the problem BOOL-SAT-TWICE Instances: Boolean expressions F Property: There are (at least) two different valuations that satisfy F. Show that BooL-SAT-TWICE ?s NP-complete.

(20%) Consider the problem BOOL-SAT-TWICE Instances: Boolean expressions F Property: There

(20%) Consider the problem BOOL-SAT-TWICE Instances: Boolean expressions F Property: There are (at least) two different valuations that satisfy F. Show that BooL-SAT-TWICE ?s NP-complete. You may assume that BoOL-SAT ?s NP-hard

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