With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: A choir, in spotlight, standing in a semi-circle, being lead by a conductor, who is in shadow in front of the choir, and wearing a gray and black striped shirt and black pants An a capella group is getting ready to perform in front of a massive audience.
text_B: There are no musical instruments.
strengthener.