(Gas masks) may be distributed in years.Logical formLearned from6 sentences. Members may wear (gas masks).Logical formLearned from6 sentences. Medics can be in surgical masks.Logical formLearned from6 sentences. Assailants may wear black masks.Logical formLearned from6 sentences. Firefighters may wear (breathing masks).Logical formLearned from6 sentences. A (state law) may bar groups of demonstrators from masks.Logical formLearned from6 sentences. Masks may be gone.Logical formLearned from6 sentences. Firefighters may wear (oxygen masks).Logical formLearned from6 sentences. Some residents may don surgical masks.Logical formLearned from6 sentences. A face may be covered by a (wax mask).Logical formLearned from6 sentences. (Security forces) may wear masks.Logical formLearned from6 sentences. A voice may be muffled by a mask.Logical formLearned from6 sentences. A shooter may wear a mask.Logical formLearned from6 sentences. (Gas masks) can be homemade.Logical formLearned from6 sentences. Participants may insist on wearing masks.Logical formLearned from6 sentences.