A rocket may undergo an explosion.Logical formLearned from103 sentences. A person may hear explosions.Logical formLearned from103 sentences. An anniversary may pertain-to an explosion.Logical formLearned from102 sentences. Explosions can be sudden.Logical formLearned from102 sentences. Some soldiers may be killed in an explosion.Logical formLearned from102 sentences. An explosion can be tragic.Logical formLearned from101 sentences. Some explosions may go_off.Logical formLearned from101 sentences. A device may undergo an explosion.Logical formLearned from101 sentences. Explosions may rock a world-city.Logical formLearned from101 sentences. Fire may undergo explosions.Logical formLearned from101 sentences. A (suicide bomber) may set_off an explosion.Logical formLearned from99 sentences. A person may hear some explosions.Logical formLearned from99 sentences. Explosions may continue.Logical formLearned from98 sentences. A female may hear an explosion.Logical formLearned from98 sentences. An explosion can be at a refinery.Logical formLearned from98 sentences.