Police can be in (gas masks).Logical formLearned from21 sentences. A mask may break.Logical formLearned from21 sentences. A mask can be comic.Logical formLearned from21 sentences. A mask can be binary.Logical formLearned from21 sentences. A mask may cover a nose.Logical formLearned from21 sentences. (Gauze masks) can be white.Logical formLearned from21 sentences. (Oxygen masks) may drop from a ceiling.Logical formLearned from21 sentences. A face may be hid by a mask.Logical formLearned from21 sentences. Staff may wear masks.Logical formLearned from21 sentences. A mask can be regular.Logical formLearned from20 sentences. A mask can be triangular.Logical formLearned from20 sentences. A mask can be smooth.Logical formLearned from20 sentences. Care can be in a mask.Logical formLearned from20 sentences. A mask may be gone.Logical formLearned from20 sentences. A mask can be polite.Logical formLearned from20 sentences.