Proofs may be checked.Logical formLearned from5 sentences. A (flash player garbage collector) may check for references.Logical formLearned from5 sentences. Units may be checked.Logical formLearned from5 sentences. A decline may be checked.Logical formLearned from5 sentences. Letters may be checked.Logical formLearned from5 sentences. (Blood levels) may be checked.Logical formLearned from5 sentences. A crew may check.Logical formLearned from5 sentences. Persons may check dates.Logical formLearned from5 sentences. Characteristics may be checked.Logical formLearned from5 sentences. A person may check (account balances).Logical formLearned from5 sentences. A person may check a source.Logical formLearned from5 sentences. A processor may check.Logical formLearned from5 sentences. (Compiler cannots) may check.Logical formLearned from5 sentences. A command may check a line.Logical formLearned from5 sentences. Some (polygon features) may be checked for topology.Logical formLearned from5 sentences.