Air can be periodic.Logical formLearned from10 sentences. (Work stoppages) can be periodic.Logical formLearned from10 sentences. Disagreements can be periodic.Logical formLearned from10 sentences. (Flash floods) can be periodic.Logical formLearned from10 sentences. Extensions can be periodic.Logical formLearned from10 sentences. (Population explosions) can be periodic.Logical formLearned from10 sentences. Employment can be periodic.Logical formLearned from9 sentences. Revelations can be periodic.Logical formLearned from9 sentences. An amount can be periodic.Logical formLearned from9 sentences. A bulletin can be periodic.Logical formLearned from9 sentences. Statistics can be periodic.Logical formLearned from9 sentences. Pulsations can be periodic.Logical formLearned from9 sentences. A growth can be periodic.Logical formLearned from9 sentences. A region may pertain-to a periodic table.Logical formLearned from9 sentences. Rants can be periodic.Logical formLearned from9 sentences.