With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: An older bearded gentleman in glasses is reading a book in front of an open laptop, possibly in a classroom. A bearded gentleman in glasses is reading "Harry Potter" in front of his laptop, possibly in a classroom for first graders.
text_B: There is a chalkboard behind the man with "Today's Lesson" written on it.
strengthener.