(Riot police) can be on alert.Logical formLearned from21 sentences. (Riot police) may be seen.Logical formLearned from21 sentences. (Food riots) may break_out.Logical formLearned from21 sentences. A series can be constituted-of-or-filled-with (race riots).Logical formLearned from21 sentences. A heart may start a riot.Logical formLearned from21 sentences. A mind can be a riot of emotions.Logical formLearned from21 sentences. Riots can be over food.Logical formLearned from21 sentences. Riots may pertain-to a park.Logical formLearned from21 sentences. A height may pertain-to a riot.Logical formLearned from21 sentences. A riot can be regular.Logical formLearned from21 sentences. A (riot police cordon) may guard a legislature.Logical formLearned from21 sentences. A male may expect riots.Logical formLearned from21 sentences. Religious riots may erupt.Logical formLearned from21 sentences. Protests may turn into riots.Logical formLearned from21 sentences. Destruction of a mosque may spark riots.Logical formLearned from21 sentences.