Crude oil can be for delivery.Logical formLearned from206 sentences. An (oil field) may undergo a development.Logical formLearned from205 sentences. (Oil prices) may sink.Logical formLearned from205 sentences. An (oil bill) may pertain-to a country.Logical formLearned from205 sentences. (Oil exports) can be to a country.Logical formLearned from204 sentences. An (oil group) may pertain-to a country.Logical formLearned from204 sentences. Oil may flow.Logical formLearned from203 sentences. (Oil riches) may pertain-to a country.Logical formLearned from203 sentences. Cooperation can be in oil.Logical formLearned from203 sentences. An (oil supply) may pertain-to persons.Logical formLearned from202 sentences. Oil may be produced.Logical formLearned from201 sentences. (Oil prices) can be stable.Logical formLearned from201 sentences. Control may pertain-to (oil resources).Logical formLearned from201 sentences. A value may pertain-to oil.Logical formLearned from201 sentences. Oil can be lucrative.Logical formLearned from201 sentences.