Fossil fuels can be dirty.Logical formLearned from65 sentences. Fuel can be for (power reactors).Logical formLearned from65 sentences. A (family film) may lack a fuel.Logical formLearned from65 sentences. A (fuel bill) may pertain-to a person.Logical formLearned from65 sentences. Availability may pertain-to a fuel.Logical formLearned from65 sentences. Fuel may undergo an exchange.Logical formLearned from65 sentences. A (fuel economy) can be unmatched.Logical formLearned from64 sentences. A fuel may pertain-to the world.Logical formLearned from64 sentences. Hikes can be in (fuel prices).Logical formLearned from64 sentences. An alternative can be to fuel.Logical formLearned from64 sentences. (Fuel shortages) can be acute.Logical formLearned from64 sentences. A fuel may run.Logical formLearned from64 sentences. Fossil fuels may run_out.Logical formLearned from64 sentences. Spent nuclear fuel may undergo a disposal.Logical formLearned from63 sentences. Fuel may be needed.Logical formLearned from63 sentences.