With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: While playing soccer, a man in yellow starts to fall, while a man in white trips over him, stepping on his ankle in the process. Two mean accidently trip over eachother trying to get the soccerball.
text_B: There is a large rock in the middle of the field that many people trip over.
weakener.