Columns may pertain-to a periodic table.Logical formLearned from4 sentences. A pest can be periodic.Logical formLearned from4 sentences. A correction can be periodic.Logical formLearned from4 sentences. Transactions can be periodic.Logical formLearned from4 sentences. (Emergency response drills) can be periodic.Logical formLearned from4 sentences. Views can be periodic.Logical formLearned from4 sentences. A value can be periodic.Logical formLearned from4 sentences. Occupations can be periodic.Logical formLearned from4 sentences. Natural disasters can be periodic.Logical formLearned from4 sentences. A weekend can be periodic.Logical formLearned from4 sentences. (Staff meetings) can be periodic.Logical formLearned from4 sentences. Projections can be periodic.Logical formLearned from4 sentences. Remissions can be periodic.Logical formLearned from4 sentences. Sounds can be periodic.Logical formLearned from4 sentences. A wave can be periodic.Logical formLearned from4 sentences.