A (user list) can be valid.Logical formLearned from8 sentences. A system can be valid.Logical formLearned from8 sentences. (Research findings) can be valid.Logical formLearned from8 sentences. A behavior can be valid.Logical formLearned from8 sentences. Rows can be valid.Logical formLearned from8 sentences. An (assembler code) can be valid.Logical formLearned from8 sentences. A contractual obligation can be valid.Logical formLearned from8 sentences. Equations can be valid.Logical formLearned from8 sentences. A (time period) can be valid.Logical formLearned from8 sentences. Pairs can be valid.Logical formLearned from8 sentences. A (distance measurement) can be valid.Logical formLearned from8 sentences. A binding agreement can be valid.Logical formLearned from8 sentences. Answers can be valid.Logical formLearned from8 sentences. A (card number) can be valid.Logical formLearned from8 sentences. A http-date can be valid.Logical formLearned from8 sentences.