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:
the Open Source sustainability crisis.
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│ Host Kernel (Ring 0) │ ◄── FULL ATTACK SURFACE
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同样重要的还有空间。零跑很清楚：在这个价位，车子可以小，但内部空间可不能小。