Visas can be valid.Logical formLearned from62 sentences. A system can be valid.Logical formLearned from62 sentences. An agreement can be valid.Logical formLearned from61 sentences. Principles can be valid.Logical formLearned from61 sentences. A class can be valid.Logical formLearned from61 sentences. Xmls can be valid.Logical formLearned from60 sentences. A (birth certificate) can be valid.Logical formLearned from60 sentences. An objective can be valid.Logical formLearned from60 sentences. A string can be valid.Logical formLearned from59 sentences. Approaches can be valid.Logical formLearned from59 sentences. Cases can be valid.Logical formLearned from59 sentences. Comments can be valid.Logical formLearned from59 sentences. An indication can be valid.Logical formLearned from59 sentences. A (credit card number) can be valid.Logical formLearned from59 sentences. A registration can be valid.Logical formLearned from59 sentences.