A person may purchase (music files).Logical formLearned from47 sentences. (Music files) can be from a site.Logical formLearned from47 sentences. A file can be on a disk.Logical formLearned from47 sentences. A file may disappear.Logical formLearned from47 sentences. Files may be corrupted.Logical formLearned from47 sentences. Files can be public.Logical formLearned from47 sentences. Files may pertain-to students.Logical formLearned from47 sentences. Overheads may be downloaded as a single file.Logical formLearned from47 sentences. Files can be disciplinary.Logical formLearned from47 sentences. A file may be required.Logical formLearned from47 sentences. Data can be in a file.Logical formLearned from47 sentences. A (configuration file) can be personal.Logical formLearned from47 sentences. A file can be classified.Logical formLearned from47 sentences. A file can be in a current directory.Logical formLearned from47 sentences. A file may remain open.Logical formLearned from47 sentences.