A (nerve gas) may be used in a (subway attack).Logical formLearned from69 sentences. (Gas stations) may pertain-to a US-city.Logical formLearned from68 sentences. (Gas prices) may be spiked.Logical formLearned from68 sentences. A (gas leak) can be toxic.Logical formLearned from68 sentences. (Greenhouse gas emissions) can be man-made.Logical formLearned from68 sentences. Volumes can be constituted-of-or-filled-with natural gas.Logical formLearned from68 sentences. A (gas mileage) can be high.Logical formLearned from68 sentences. A (gas chamber) may pertain-to a us-state.Logical formLearned from68 sentences. (Natural gas) may settle_up some cents.Logical formLearned from68 sentences. A (gas pipeline) can be controversial.Logical formLearned from68 sentences. Natural gas may be used.Logical formLearned from67 sentences. A male may step on gas.Logical formLearned from67 sentences. (Carbon dioxide) can be gas.Logical formLearned from67 sentences. A person may have a tank of gas.Logical formLearned from67 sentences. A person can be at a (gas station).Logical formLearned from67 sentences.