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:
Жители Санкт-Петербурга устроили «крысогон»17:52
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In December, the Environment Agency estimated that by 2050 one in four properties would be at risk from flooding. This is the first time the EA has considered how a warmer climate could affect flooding in the UK.
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