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:
"Because we can, because we're young, we push ourselves too hard, we burn the candle at both ends, she said, which created problems that arose when people where in their 50s.
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