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 waitress is bringing soda to the customers.
text_B: The cafe has an old fashioned soda fountain from the 1950's.
strengthener.