(Gas resources) can be rich.Logical formLearned from13 sentences. An explosion may be caused by gas.Logical formLearned from13 sentences. A country may extract gas from a field.Logical formLearned from13 sentences. A (gas dispute) may lead to drops.Logical formLearned from13 sentences. A role can be in some (gas attack).Logical formLearned from13 sentences. Gas may catch fire.Logical formLearned from13 sentences. An anniversary may pertain-to a (nerve gas attack).Logical formLearned from13 sentences. Peacekeepers may fire gas.Logical formLearned from13 sentences. Some (gas stations) may open.Logical formLearned from13 sentences. A (natural gas company) may pertain-to a country.Logical formLearned from13 sentences. A country may sit on reserve of natural gas.Logical formLearned from13 sentences. Men may be gathered at a (gas station).Logical formLearned from13 sentences. A round can be constituted-of-or-filled-with gas.Logical formLearned from13 sentences. A crowd may use gas.Logical formLearned from13 sentences. A (methyl isocyanate gas) can be toxic.Logical formLearned from13 sentences.