With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: A stocky gentleman wearing a long-sleeve, blue shirt, black slacks, aged, black boots and a blue billed cap is scaling a roof, using the structure's struts to approach stacks of tiles stored at the roof's apex. The man is a roofer.
text_B: The back of his shirt says "Roofing Co."
strengthener.