(Oil fields) may undergo a development.Logical formLearned from151 sentences. Oil can be dirty.Logical formLearned from150 sentences. (Oil reserve) may pertain-to persons.Logical formLearned from150 sentences. (Crude oil) may fall some cents.Logical formLearned from150 sentences. A bulk may pertain-to oil.Logical formLearned from150 sentences. (Oil prices) may fall some percent.Logical formLearned from150 sentences. Oil may start.Logical formLearned from149 sentences. An (oil crisis) may pertain-to 1970s.Logical formLearned from149 sentences. (Oil facilities) may pertain-to a country.Logical formLearned from149 sentences. (Oil companies) may pertain-to persons.Logical formLearned from149 sentences. (Oil revenues) may undergo a distribution.Logical formLearned from149 sentences. A country can be (oil importer).Logical formLearned from149 sentences. An (oil center) may pertain-to a country.Logical formLearned from149 sentences. Attacks can be on (oil pipelines).Logical formLearned from149 sentences. A return can be to an (oil market).Logical formLearned from149 sentences.