With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Legion is the main character of an FX show.
text_B: The Rehbinder effect in physics is the reduction in the hardness and ductility of a material by a surface-active molecular film .. physics. physics. hardness. hardness. ductility. ductility. surface-active. surfactant
not_related.