(Source addresses) can be valid.Logical formLearned from4 sentences. A participant can be valid.Logical formLearned from4 sentences. A dtd can be valid.Logical formLearned from4 sentences. Exchanges can be valid.Logical formLearned from4 sentences. An ontology can be valid.Logical formLearned from4 sentences. A plan can be valid.Logical formLearned from4 sentences. A dissent can be valid.Logical formLearned from4 sentences. A conclusion can be valid.Logical formLearned from4 sentences. A person may see a valid argument.Logical formLearned from4 sentences. Articles can be valid.Logical formLearned from4 sentences. (Search warrants) can be valid.Logical formLearned from4 sentences. Products can be valid.Logical formLearned from4 sentences. Steps can be valid.Logical formLearned from4 sentences. Workarounds can be valid.Logical formLearned from4 sentences. A civil union can be valid.Logical formLearned from4 sentences.