Sources can be periodic.Logical formLearned from14 sentences. Shocks can be periodic.Logical formLearned from14 sentences. A sound can be periodic.Logical formLearned from14 sentences. Self-assessments can be periodic.Logical formLearned from14 sentences. A recovery can be periodic.Logical formLearned from14 sentences. A medical examination can be periodic.Logical formLearned from14 sentences. Costs can be periodic.Logical formLearned from14 sentences. Losses can be periodic.Logical formLearned from14 sentences. Literature can be periodic.Logical formLearned from14 sentences. A (payment plan) can be periodic.Logical formLearned from14 sentences. Lattices can be periodic.Logical formLearned from14 sentences. (Finance charges) can be periodic.Logical formLearned from14 sentences. An e-newsletter can be periodic.Logical formLearned from14 sentences. Headaches can be periodic.Logical formLearned from14 sentences. (Air strikes) can be periodic.Logical formLearned from14 sentences.