A riot can be in a history.Logical formLearned from20 sentences. Persons may push riots.Logical formLearned from20 sentences. A role can be in a riot.Logical formLearned from20 sentences. A male may cover riots.Logical formLearned from20 sentences. (Riot police) may be ringed.Logical formLearned from20 sentences. (Riot police) may be armed with truncheons.Logical formLearned from20 sentences. Soldiers can be with (riot shields).Logical formLearned from20 sentences. A (food crisis) may spark riots.Logical formLearned from20 sentences. Some riots can be in a western state.Logical formLearned from20 sentences. Riots may pertain-to a month.Logical formLearned from20 sentences. Riots can be in a nation.Logical formLearned from20 sentences. Riots may be swept.Logical formLearned from20 sentences. Riots can be in 1960s.Logical formLearned from20 sentences. Riots may rock a world-city.Logical formLearned from20 sentences. A string can be constituted-of-or-filled-with riots.Logical formLearned from20 sentences.