A cause of an explosion may remain unknown.Logical formLearned from22 sentences. Explosions can be low-level.Logical formLearned from22 sentences. An explosion can be uncontrolled.Logical formLearned from22 sentences. Nuclear devices may undergo an explosion.Logical formLearned from22 sentences. An engine may undergo an explosion.Logical formLearned from21 sentences. An explosion may damage a building.Logical formLearned from21 sentences. An explosion may destroy part of a headquarters.Logical formLearned from21 sentences. Words may undergo an explosion.Logical formLearned from21 sentences. Explosions may cause damage.Logical formLearned from21 sentences. An explosion may be caused by a (car bomb).Logical formLearned from21 sentences. An explosion may occur at a mine.Logical formLearned from21 sentences. A landmine may undergo an explosion.Logical formLearned from21 sentences. A (bus explosion) can be in a world-city.Logical formLearned from21 sentences. Explosions may stop.Logical formLearned from21 sentences. A connection can be between an explosion.Logical formLearned from21 sentences.