With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Guest stars actor Dan Stevens.
text_B: The Abernathy Pearl , also nicknamed the Little Willie Pearl , is a 44-grain pearl discovered in 1967 in the River Tay , Scotland .. pearl. pearl. River Tay. River Tay. Scotland. Scotland. It was produced by a mussel belonging to the species Margaritifera margaritifera .. mussel. mussel. Margaritifera margaritifera. Margaritifera margaritifera. The pearl is named after its discoverer , William Abernathy .. pearl. pearl. It has a spherical shape .. The pearl is pinkish-white , with a white hue and a slightly pink overtone .. pearl. pearl
not_related.