With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Black Sabbath formed in Europe.
text_B: An independent measures design is a type of method used during a psychology experiment that involves two or more separate groups , each containing different individuals , where each participant only takes part in each condition once .. psychology experiment. Psychology#Controlled experiments. See also Repeated measures design .. Repeated measures design. Repeated measures design
not_related.