A concept can be valid.Logical formLearned from114 sentences. A result can be valid.Logical formLearned from113 sentences. A message can be valid.Logical formLearned from112 sentences. Contracts can be valid.Logical formLearned from111 sentences. A deal can be valid.Logical formLearned from111 sentences. A person can be valid.Logical formLearned from110 sentences. An url can be valid.Logical formLearned from110 sentences. A (work permit) can be valid.Logical formLearned from110 sentences. An input can be valid.Logical formLearned from110 sentences. An opinion can be valid.Logical formLearned from108 sentences. A link can be valid.Logical formLearned from107 sentences. Users can be valid.Logical formLearned from106 sentences. A comparison can be valid.Logical formLearned from105 sentences. A social-security number can be valid.Logical formLearned from105 sentences. Knowledge can be valid.Logical formLearned from105 sentences.