(Oil sales) can be illegal.Logical formLearned from53 sentences. Oil may undergo an extraction.Logical formLearned from53 sentences. A crude oil can be international.Logical formLearned from53 sentences. (Oil prices) may turn.Logical formLearned from53 sentences. An (oil rig) may explode.Logical formLearned from53 sentences. A center may pertain-to (oil fields).Logical formLearned from53 sentences. A route can be for oil.Logical formLearned from53 sentences. Oil may be denominated in dollars.Logical formLearned from53 sentences. A subsidiary can be constituted-of-or-filled-with (oil company).Logical formLearned from53 sentences. Production can be in an (oil exporter).Logical formLearned from53 sentences. Some metric tons can be constituted-of-or-filled-with (crude oil).Logical formLearned from53 sentences. A rise can be in (world oil prices).Logical formLearned from53 sentences. Representative can be constituted-of-or-filled-with (oil companies).Logical formLearned from53 sentences. (Oil giants) may pertain-to the world.Logical formLearned from53 sentences. Signs can be constituted-of-or-filled-with oil.Logical formLearned from53 sentences.