With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: A tournament is the 2011 FIFA U-20 World Cup.
text_B: Santa Rosa do Piaui is a municipality in the state of Piaui in the Northeast region of Brazil .. Piaui. Piaui. municipality. Municipalities of Brazil. state. states of Brazil. Northeast region. Northeast Region, Brazil. Brazil. Brazil
not_related.