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:
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Amu的經歷反映了台灣外籍移工面臨的弱勢處境，不少人因為債務纏身，而落入國際定義的「強迫勞動」。