(Polarity reversals) can be periodic.Logical formLearned from2 sentences. Fringes can be periodic.Logical formLearned from2 sentences. Refuelings can be periodic.Logical formLearned from2 sentences. Elements can be to a periodic table.Logical formLearned from2 sentences. A periodic table can be as lead.Logical formLearned from2 sentences. A team may add element to a periodic table.Logical formLearned from2 sentences. A republication can be periodic.Logical formLearned from2 sentences. Sittings can be periodic.Logical formLearned from2 sentences. Musters can be periodic.Logical formLearned from2 sentences. A social disruption can be periodic.Logical formLearned from2 sentences. (Rate determinations) can be periodic.Logical formLearned from2 sentences. A (road testing) can be periodic.Logical formLearned from2 sentences. A (health history questionnaire) can be periodic.Logical formLearned from2 sentences. A (motor vehicle inspection) can be periodic.Logical formLearned from2 sentences. A stopping can be periodic.Logical formLearned from2 sentences.