instruction:
In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly contradict each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.
question:
Sentence 1: A man with a shaved head and a button-up shirt looks into a microscope near a poster about red blood cells. Sentence 2: A scientist studies a vaccine.
answer:
A man without hair near a poster about red blood cells is looking through a microscope.


question:
Sentence 1: Two employees knead and prepare dough for use with making cakes as seen through the window. Sentence 2: Two employees kneading dough before a large baking competition.
answer:
Two employees kneading dough.


question:
Sentence 1: A boy trying to climb a wall. Sentence 2: The boy is trying to climb a wall with ledges on it.
answer:

A boy is climbing.