With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: London is the location of a place.
text_B: The River Don is a 15.4 km long tributary of the River Tyne in Tyne and Wear , North East England .. River Tyne. River Tyne. Tyne and Wear. Tyne and Wear. North East England. North East England. It rises near Springwell and flows east for about 6 km , then turns north .. Springwell. Springwell Estate. It meets the river Tyne at Jarrow .. Jarrow. Jarrow
not_related.