Problems can be valid.Logical formLearned from17 sentences. A justification can be valid.Logical formLearned from17 sentences. A termination can be valid.Logical formLearned from17 sentences. A trade can be valid.Logical formLearned from17 sentences. A questionnaire can be valid.Logical formLearned from17 sentences. A legal status can be valid.Logical formLearned from17 sentences. A (partition table) can be valid.Logical formLearned from17 sentences. Properties can be valid.Logical formLearned from17 sentences. An investigation can be valid.Logical formLearned from17 sentences. A condition can be valid.Logical formLearned from17 sentences. A perception can be valid.Logical formLearned from17 sentences. A (control group) can be valid.Logical formLearned from17 sentences. A notion can be valid.Logical formLearned from17 sentences. A ballot can be valid.Logical formLearned from17 sentences. Some methods can be valid.Logical formLearned from17 sentences.