There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
2,073 parseable picks
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Jacqui Gabb, Professor of Sociology and Intimacy at The Open University, assessed this in her Enduring Love project, published in the journal Sociology in 2015.
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Трамп высказался о непростом решении по Ирану09:14，推荐阅读搜狗输入法2026获取更多信息
For SAT problems with 10 variables and 200 clauses, it usually output SAT as expected, but the assignment was never valid (Examples: first, second). Once it claimed a SAT formula was UNSAT. For this reason I didn't bother testing with more variables for the SAT case.