A head may pertain-to a national (oil company).Logical formLearned from63 sentences. An (oil company) may pertain-to a US-city.Logical formLearned from63 sentences. An (oil infrastructure) can be vital.Logical formLearned from63 sentences. A fall can be in (world oil prices).Logical formLearned from63 sentences. Oil may be replaced.Logical formLearned from63 sentences. A mixture can be constituted-of-or-filled-with olive oil.Logical formLearned from63 sentences. (Oil supplies) can be stable.Logical formLearned from63 sentences. (Oil resources) can be offshore.Logical formLearned from63 sentences. (Oil prices) may end.Logical formLearned from63 sentences. An attack can be on an (oil tanker).Logical formLearned from63 sentences. (Oil prices) may hit a (record high).Logical formLearned from63 sentences. A member may pertain-to an (oil cartel).Logical formLearned from63 sentences. Oil may rally.Logical formLearned from63 sentences. Reserve can be constituted-of-or-filled-with (crude oil).Logical formLearned from63 sentences. (Oil installations) can be in a country.Logical formLearned from63 sentences.