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Boolean satisfiability problem
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=== Linear SAT === A 3-SAT formula is ''Linear SAT'' (''LSAT'') if each clause (viewed as a set of literals) intersects at most one other clause, and, moreover, if two clauses intersect, then they have exactly one literal in common. An LSAT formula can be depicted as a set of disjoint semi-closed intervals on a line. Deciding whether an LSAT formula is satisfiable is NP-complete.<ref>{{Cite journal|last1=Arkin|first1=Esther M.|last2=Banik|first2=Aritra|last3=Carmi|first3=Paz|last4=Citovsky|first4=Gui|last5=Katz|first5=Matthew J.|last6=Mitchell|first6=Joseph S. B.|last7=Simakov|first7=Marina|date=2018-12-11|title=Selecting and covering colored points|journal=Discrete Applied Mathematics|language=en|volume=250|pages=75β86|doi=10.1016/j.dam.2018.05.011|issn=0166-218X|doi-access=free}}</ref>
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