An operation can be a proof.Logical formLearned from26 sentences. A proof can be black-and-white.Logical formLearned from26 sentences. A proof may pertain-to a strength.Logical formLearned from26 sentences. A proof can be spectacular.Logical formLearned from26 sentences. Proof may pertain-to a maturity.Logical formLearned from26 sentences. A proof may pertain-to a resurrection.Logical formLearned from26 sentences. A win can be a proof.Logical formLearned from26 sentences. A proof may pertain-to importance.Logical formLearned from26 sentences. A world-city may demand proof of deaths.Logical formLearned from26 sentences. Proof may pertain-to a capacity.Logical formLearned from26 sentences. A proof can be constituted-of-or-filled-with identification.Logical formLearned from25 sentences. Proofs can be algebraic.Logical formLearned from25 sentences. A proof may pertain-to a case.Logical formLearned from25 sentences. Proof of age may be required.Logical formLearned from25 sentences. Proofs can be revised.Logical formLearned from25 sentences.