An economic system may prove unworkable.Logical formLearned from5 sentences. Some physicists may make a breakthrough by proving that something-is-the-case.Logical formLearned from5 sentences. An escalation may prove that something-is-the-case.Logical formLearned from5 sentences. Means may prove effective.Logical formLearned from5 sentences. Maneuvers may prove that something-is-the-case.Logical formLearned from5 sentences. Problems may prove that something-is-the-case.Logical formLearned from5 sentences. An end may prove that something-is-the-case.Logical formLearned from5 sentences. A miracle may be proven.Logical formLearned from5 sentences. An event may prove a person.Logical formLearned from5 sentences. A method may prove satisfactory.Logical formLearned from5 sentences. Power may prove useful.Logical formLearned from5 sentences. A hope may prove illusory.Logical formLearned from5 sentences. A male may prove a capacity.Logical formLearned from5 sentences. A government may prove itself.Logical formLearned from5 sentences. Calculations may prove correct.Logical formLearned from5 sentences.