Dimmings can be periodic.Logical formLearned from9 sentences. A turbulence can be periodic.Logical formLearned from9 sentences. Gifts can be periodic.Logical formLearned from9 sentences. A rise can be periodic.Logical formLearned from8 sentences. A coverage can be periodic.Logical formLearned from8 sentences. Roundups can be periodic.Logical formLearned from8 sentences. Copies can be periodic.Logical formLearned from8 sentences. A replenishment can be periodic.Logical formLearned from8 sentences. Congresses can be periodic.Logical formLearned from8 sentences. A heavy rain can be periodic.Logical formLearned from8 sentences. A periodic system may pertain-to elements.Logical formLearned from8 sentences. (Raiding expeditions) can be periodic.Logical formLearned from8 sentences. Inundations can be periodic.Logical formLearned from8 sentences. Rechargings can be periodic.Logical formLearned from8 sentences. (Maintenance fees) can be periodic.Logical formLearned from8 sentences.