A boy may have an (oxygen mask).Logical formLearned from7 sentences. Gunmen may wear (ski masks).Logical formLearned from7 sentences. A postal-service may distribute masks.Logical formLearned from7 sentences. (Gas masks) can be as journalists.Logical formLearned from7 sentences. (Surplus stores) may report sales of (gas masks).Logical formLearned from7 sentences. Masks may load shells of (mustard gas).Logical formLearned from7 sentences. A male may wear a (trademark ski mask).Logical formLearned from7 sentences. (Gas masks) can be with parts.Logical formLearned from7 sentences. Sales can be constituted-of-or-filled-with masks.Logical formLearned from7 sentences. Troops can be in (ski masks).Logical formLearned from7 sentences. Guards may wear (ski masks).Logical formLearned from7 sentences. An offer can be constituted-of-or-filled-with (gas masks).Logical formLearned from7 sentences. A person may wear (face masks).Logical formLearned from7 sentences. An (army distribution center) can be for a (gas mask).Logical formLearned from7 sentences. (Riot police) can be in (ski masks).Logical formLearned from7 sentences.