Clashes can be between (riot police).Logical formLearned from17 sentences. Some persons may be involved in riots.Logical formLearned from17 sentences. Riots may erupt on a month.Logical formLearned from17 sentences. Riots may sweep a country.Logical formLearned from17 sentences. A riot can be constituted-of-or-filled-with violence.Logical formLearned from17 sentences. A repeat may pertain-to a riot.Logical formLearned from17 sentences. An end may pertain-to a riot.Logical formLearned from17 sentences. A riot may happen.Logical formLearned from16 sentences. A riot can be at a prison.Logical formLearned from16 sentences. Riots can be daylong.Logical formLearned from16 sentences. A response can be to riots.Logical formLearned from16 sentences. Involvement can be in riots.Logical formLearned from16 sentences. A (riot act) may undergo reading.Logical formLearned from16 sentences. A riot can be ugly.Logical formLearned from16 sentences. An end can be to riots.Logical formLearned from16 sentences.