With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: A young girl in a green shirt and shorts out riding her bike past a very nice apartment building. A girl with blonde hair is riding her bike in the street outside of a 20 story apartment building.
text_B: A brunette who changed her hair color to a lighter yellow is riding her bike in the street.
strengthener.