With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Usain Bolt is an Olympic sprinter.
text_B: Estadio Municipal de Calulo is a multi-use stadium in Calulo , Angola .. Calulo. Calulo. Angola. Angola. stadium. stadium. It is primarily used for football and serves as the home ground for C.R.D. Libolo of the Girabola .. C.R.D. Libolo. C.R.D. Libolo. football. football ( soccer ). Girabola. Girabola. The stadium holds 10,000 spectators .. stadium. stadium
not_related.