With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: A man with an arm brace and a walking cane on a paved walkway at a park green, an older man is standing directly behind him and two other people are on the distant grass. an injured man walked on the side walk while others were in the grass having fun
text_B: The second man is a nurse.
strengthener.