With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Harvey Kurtzman has yet to teach at the School of Visual Arts.
text_B: The mixed doubles tennis event at the 2013 Summer Universiade was held from July 8 to 16 at the Tennis Academy in Kazan , Russia .. 2013 Summer Universiade. 2013 Summer Universiade. Kazan. Kazan
not_related.