A teenager may spark riots.Logical formLearned from9 sentences. A death may spark riots.Logical formLearned from9 sentences. Riots may kill hundreds of residents.Logical formLearned from9 sentences. Riots may be sparked by a (police shooting) of a teenager.Logical formLearned from9 sentences. A riot can be violence.Logical formLearned from9 sentences. A decision may trigger riots.Logical formLearned from9 sentences. Riots may explode.Logical formLearned from9 sentences. An unit can be constituted-of-or-filled-with (riot police).Logical formLearned from9 sentences. A riot can be in history.Logical formLearned from9 sentences. Riots may occur in a US-city.Logical formLearned from9 sentences. A US-city may draft riots.Logical formLearned from9 sentences. A (riot guitarist) can be quiet.Logical formLearned from9 sentences. A riot can be a riot.Logical formLearned from9 sentences. (Prison riots) can be deadly.Logical formLearned from9 sentences. (Riot police) may enter a compound.Logical formLearned from9 sentences.