With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: A Chinese state-run oil company is offering to buy U.S.-based Unocal Oil for $ 18.5 billion in cash , more than a rival offer by U.S.-based Chevron Corporation .
text_B: U.S.-based Chevron Corporation is an artefact
not-entailed.