A doctor can be valid.Logical formLearned from20 sentences. Astrology can be valid.Logical formLearned from20 sentences. A status can be valid.Logical formLearned from20 sentences. A (return e-mail address) can be valid.Logical formLearned from20 sentences. Exceptions can be valid.Logical formLearned from20 sentences. A notion can be valid.Logical formLearned from20 sentences. (Outcome measures) can be valid.Logical formLearned from20 sentences. Actions can be valid.Logical formLearned from20 sentences. A guarantee can be valid.Logical formLearned from20 sentences. Policies can be valid.Logical formLearned from20 sentences. A balloting can be valid.Logical formLearned from20 sentences. A challenge can be valid.Logical formLearned from20 sentences. An (immigration status) can be valid.Logical formLearned from19 sentences. A protest can be valid.Logical formLearned from19 sentences. Attacks can be valid.Logical formLearned from19 sentences.