Students may check prerequisites.Logical formLearned from3 sentences. Files may be checked for effects.Logical formLearned from3 sentences. Some towers may be checked for dead birds.Logical formLearned from3 sentences. An information may be checked against information.Logical formLearned from3 sentences. Parents may check a homework.Logical formLearned from3 sentences. (Input data) may be checked.Logical formLearned from3 sentences. A (source host) may check validity of an address by sending a query.Logical formLearned from3 sentences. A person may check a newsgroup.Logical formLearned from3 sentences. An operation may check.Logical formLearned from3 sentences. A government may check research.Logical formLearned from3 sentences. A deity may be checked.Logical formLearned from3 sentences. Travelers may be checked.Logical formLearned from3 sentences. An information may be checked for consistency.Logical formLearned from3 sentences. A line may check.Logical formLearned from3 sentences. A person may check snow.Logical formLearned from3 sentences.