Certificates may prove that something-is-the-case.Logical formLearned from18 sentences. A move may prove controversial.Logical formLearned from18 sentences. A concept may prove popular.Logical formLearned from18 sentences. An issue of powers may prove a (sticking point).Logical formLearned from18 sentences. Military action may prove necessary.Logical formLearned from18 sentences. Talks may prove that something-is-the-case.Logical formLearned from18 sentences. An attempt may prove futile.Logical formLearned from17 sentences. A person may prove an existence.Logical formLearned from17 sentences. A male may prove true.Logical formLearned from17 sentences. A male may prove a hit.Logical formLearned from17 sentences. A plan may prove controversial.Logical formLearned from17 sentences. Worries may prove unfounded.Logical formLearned from17 sentences. A male may prove a theorem.Logical formLearned from17 sentences. Mathematicians may prove that something-is-the-case.Logical formLearned from17 sentences. (Test results) may prove that something-is-the-case.Logical formLearned from17 sentences.