With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Muhammad Ali was nicknamed in 1970.
text_B: Cystiscus vavauensis is a species of very small sea snail , a marine gastropod mollusk or micromollusk in the family Cystiscidae .. Cystiscidae. Cystiscidae. Cystiscus. Cystiscus. species. species. sea snail. sea snail. gastropod. gastropod. mollusk. mollusk. micromollusk. micromollusk. family. family ( biology )
not_related.