With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Stephen Hawking has been incapacitated.
text_B: Tecticrater cervae is a species of very small deepwater limpet , a marine gastropod mollusc in the family Lepetellidae .. Lepetellidae. Lepetellidae. Tecticrater. Tecticrater. species. species. limpet. limpet. marine. marine ( ocean ). gastropod. gastropod. mollusc. mollusc. family. family ( biology )
not_related.