With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Laurie Hernandez is an American artistic Olympic gymnast.
text_B: is a Japanese mathematician and professor at the Osaka University of Economics , where he teaches mathematics and information .. mathematician. mathematician. He is known as the `` boomerang professor '' .. He has written nine books about the mathematics in daily life .. The most recent one , The mystery of five in nature , investigates , amongst other things , why many flowers have five petals .
not_related.