With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: A person in a jacket and wearing jeans kneels down to take a picture of a graffiti-laden wall. A person in a jacket and wearing green jeans kneels down to take a picture of a wall graphittied by Banksy  .
text_B: The jeans match the grass nearby.
strengthener.