A dvd-r can be blank.Logical formLearned from13 sentences. A tone can be blank.Logical formLearned from13 sentences. A person may stare at a blank page.Logical formLearned from13 sentences. A return can be blank.Logical formLearned from13 sentences. Some ballots can be blank.Logical formLearned from13 sentences. A memory can be blank.Logical formLearned from13 sentences. A (computer screen) may go blank.Logical formLearned from13 sentences. (Computer screens) can be blank.Logical formLearned from13 sentences. A gaze can be blank.Logical formLearned from13 sentences. (Video tapes) can be blank.Logical formLearned from13 sentences. A part can be blank.Logical formLearned from13 sentences. A memory may go blank.Logical formLearned from13 sentences. A subject can be blank.Logical formLearned from13 sentences. Lines can be blank.Logical formLearned from13 sentences. Questions may be left blank.Logical formLearned from13 sentences.