With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: A waitress in a black T-shirt and black shorts at Cafe Mambo serves a tray of beverages to a seated customer in a red tank top and black bandanna. The customer has ordered a soda and a glass of water.
text_B: The waitress tells the patron that refills are free.
strengthener.