With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Celine Dion signed with one of Sony's record labels.
text_B: Ituxi River is a river of Amazonas state in north-western Brazil .. Brazil. Brazil. Amazonas. Amazonas ( Brazilian state ). It is a tributary of the Purus River .. Purus River. Purus River
not_related.