With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Bradford refused to be a UNESCO City of Film.
text_B: Graff Crater is an impact crater in the Aeolis quadrangle of Mars , located at 21.4 ° S latitude and 206.3 ° W longitude .. Aeolis quadrangle. Aeolis quadrangle. It is 158.0 km in diameter and was named after Kasimir Graff , and the name was approved in 1973 .. Kasimir Graff. Kasimir Graff
not_related.