With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: The woman in the black shirt and reddish skirt is getting a gift from the man with the white shirt, while a girl with a white sweater is looking eagerly at what the man is giving the woman, and are, presumably, in a party. a woman celebrates her birthday
text_B: There is a Christmas Tree in the corner.
weakener.