Rhythms can be periodic.Logical formLearned from9 sentences. (Class meetings) can be periodic.Logical formLearned from9 sentences. A famine can be periodic.Logical formLearned from9 sentences. A billing can be periodic.Logical formLearned from9 sentences. Presence can be periodic.Logical formLearned from9 sentences. A reviewrequirement can be periodic.Logical formLearned from9 sentences. (User surveys) can be periodic.Logical formLearned from9 sentences. Comparisons can be periodic.Logical formLearned from9 sentences. An issuance can be periodic.Logical formLearned from9 sentences. A registration can be periodic.Logical formLearned from9 sentences. (Cash payments) can be periodic.Logical formLearned from9 sentences. Plans can be periodic.Logical formLearned from9 sentences. A (skin testing) can be periodic.Logical formLearned from9 sentences. A (status report) can be periodic.Logical formLearned from9 sentences. Classes can be periodic.Logical formLearned from9 sentences.