A proof may pertain-to facts.Logical formLearned from17 sentences. Proofs can be repeated.Logical formLearned from17 sentences. Proof may pertain-to an origin.Logical formLearned from17 sentences. Proofs can be constituted-of-or-filled-with programs.Logical formLearned from17 sentences. A photograph can be a proof.Logical formLearned from17 sentences. A proof may pertain-to a need.Logical formLearned from17 sentences. Proofs can be constituted-of-or-filled-with identity.Logical formLearned from17 sentences. Proof may pertain-to a difference.Logical formLearned from17 sentences. A (cash proof) can be easy.Logical formLearned from17 sentences. A proof can be for some (layout contest).Logical formLearned from17 sentences. Proof of submission may constitute proof of receipt.Logical formLearned from17 sentences. (Proof community) can be within yours.Logical formLearned from17 sentences. Proofs can be tangible.Logical formLearned from17 sentences. A (proof book) can be experimental.Logical formLearned from17 sentences. A (proof book) may be uphelded.Logical formLearned from17 sentences.