An ethnic violence can be periodic.Logical formLearned from8 sentences. A break can be periodic.Logical formLearned from8 sentences. (Safety problems) can be periodic.Logical formLearned from8 sentences. Phosphorus can be on a periodic table.Logical formLearned from8 sentences. Spats can be periodic.Logical formLearned from8 sentences. A profit-taking can be periodic.Logical formLearned from8 sentences. A collaboration can be periodic.Logical formLearned from8 sentences. A signal can be periodic.Logical formLearned from7 sentences. A cutting can be periodic.Logical formLearned from7 sentences. Reductions can be periodic.Logical formLearned from7 sentences. Arrivals can be periodic.Logical formLearned from7 sentences. A character can be periodic.Logical formLearned from7 sentences. (Cash flows) can be periodic.Logical formLearned from7 sentences. Peaks can be periodic.Logical formLearned from7 sentences. Operators can be periodic.Logical formLearned from7 sentences.