With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Puerto Rico is located in Boston.
text_B: Goniobranchus cavae is a species of colourful sea slug , a dorid nudibranch , a marine gastropod mollusc in the family Chromodorididae .. Chromodorididae. Chromodorididae. Goniobranchus. Goniobranchus. species. species. sea slug. sea slug. nudibranch. nudibranch. marine. marine ( ocean ). gastropod. gastropod. mollusc. mollusc
not_related.