With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: In Secret stars Tom Felton as the lead role.
text_B: Vexillum vicmanoui is a species of small sea snail , marine gastropod mollusk in the family Costellariidae , the ribbed miters .. Costellariidae. Costellariidae. Vexillum. Vexillum ( gastropod ). species. species. sea snail. sea snail. gastropod. gastropod. mollusk. mollusk. family. family ( biology )
not_related.