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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But even with that level of subterfuge, the abuser was conscious of "covering their tracks", cropping or altering any identifying features, says Squire. It was impossible to work out who, or where, Lucy was.，这一点在同城约会中也有详细论述
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