An alternation can be periodic.Logical formLearned from8 sentences. Continued fractions can be periodic.Logical formLearned from8 sentences. An order can be periodic.Logical formLearned from8 sentences. Noise can be periodic.Logical formLearned from8 sentences. An eruption can be periodic.Logical formLearned from8 sentences. A doubling can be periodic.Logical formLearned from8 sentences. States can be periodic.Logical formLearned from8 sentences. An effort can be periodic.Logical formLearned from8 sentences. A practice can be periodic.Logical formLearned from8 sentences. A minimal surface can be periodic.Logical formLearned from8 sentences. A dose can be periodic.Logical formLearned from8 sentences. (Training seminars) can be periodic.Logical formLearned from8 sentences. (Health evaluations) can be periodic.Logical formLearned from8 sentences. A recopying can be periodic.Logical formLearned from8 sentences. A job can be periodic.Logical formLearned from8 sentences.