This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.
The Shark vs. Roomba debate is old news. Here's how both robot vacuum brands got dethroned.
，这一点在Line官方版本下载中也有详细论述
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Израиль нанес удар по Ирану09:28
'The Fall and Rise of Reggie Dinkins' review: Tracy Morgan and Daniel Radcliffe are a match made in comedy heaven