(Gas production) can be in a country.Logical formLearned from14 sentences. Symptoms can be constituted-of-or-filled-with (nerve gas poisoning).Logical formLearned from14 sentences. A (poison gas attack) can be in a month.Logical formLearned from14 sentences. Gas can be in an (accretion disk).Logical formLearned from14 sentences. Cars may generate some tons of a (gas carbon dioxide).Logical formLearned from14 sentences. Emphasis can be on natural gas.Logical formLearned from14 sentences. Persons may burn gas.Logical formLearned from14 sentences. Natural gas may undergo concentrations.Logical formLearned from14 sentences. A pipeline may bring natural gas.Logical formLearned from14 sentences. A switch can be to natural gas.Logical formLearned from14 sentences. A way can be to (gas chambers).Logical formLearned from14 sentences. (Gas clouds) can be dense.Logical formLearned from14 sentences. Persons can be with gas.Logical formLearned from14 sentences. (Gas vans) may undergo a use.Logical formLearned from14 sentences. A natural gas may undergo a development.Logical formLearned from14 sentences.