With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: In the spring of 2000 , the International Hydrographic Organization decided to delimit the waters within the Convergence as a fifth world ocean - the Southern Ocean - by combining the southern portions of the Atlantic Ocean , Indian Ocean , and Pacific Ocean .
text_B: Southern Ocean is a natural entity
not-entailed.