Fog may envelop a world-city.Logical formLearned from5 sentences. A fog may delay some flights.Logical formLearned from5 sentences. A pilot may be taxiing_arounded in a fog.Logical formLearned from5 sentences. A fog may pertain-to an industry.Logical formLearned from5 sentences. A fog may roll_off a river.Logical formLearned from5 sentences. An (air force plane) may crash in fog.Logical formLearned from5 sentences. Teams may press through fog.Logical formLearned from5 sentences. A fog can be in an airport.Logical formLearned from5 sentences. A super-g may be wipe_outed by fog.Logical formLearned from5 sentences. A plane may be delayed by fog.Logical formLearned from5 sentences. A dawn of a currency may remove vestiges of fog.Logical formLearned from5 sentences. A spell can be constituted-of-or-filled-with fog.Logical formLearned from5 sentences. A fog can be constituted-of-or-filled-with drugs.Logical formLearned from5 sentences. A national-agency may peer through a fog.Logical formLearned from5 sentences. A bank of fog may roll across a river.Logical formLearned from5 sentences.