With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: The iPod Nano comes in two colors , white and black , as well as two sizes , a 2GB and a 4GB , capable of holding 500 and 1,000 songs and will cost $ 199 and $ 249 USD respectively .
text_B: The coming did not happen
not-entailed.