（二）依法应当由行政机关处理的行政争议。
Scientists say DNA evidence indicates male Neanderthals and human females interbred more often than opposite
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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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