With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Big Brother 18 has a host.
text_B: The Fujita -- Storm equation is a nonlinear partial differential equation .. nonlinear. nonlinear. partial differential equation. partial differential equation. It occurs frequently in problems of nonlinear heat and mass transfer , combustion theory and theory of flows in porous media. nonlinear. nonlinear. heat. heat transfer. mass transfer. mass transfer. combustion theory. combustion theory. porous media. porous medium
not_related.