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 young man sits with his elbows on his legs while he reads a book. Sentence 2: A teenager is flipping through a book in the library.
answer:
A book reader is engrossed in his book.


question:
Sentence 1: Nine people riding their horses. Sentence 2: the people are riding their horses on a trail.
answer:
horses are being ridden


question:
Sentence 1: A man riding on the back of a trash truck. Sentence 2: The man is a city sanitation employee.
answer:

The man can smell garbage from the vehicle.