TASK DEFINITION: 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.
PROBLEM: Sentence 1: A crowd surrounds a grounded hot air balloon. Sentence 2: Crowd watching someone fly away

SOLUTION: Crowd gathering

PROBLEM: Sentence 1: There is a stand under a large blue and red umbrella with a large assortment of produce and there are several people looking through the produce. Sentence 2: The produced is at a farmer's market.

SOLUTION: There is a lot of produce.

PROBLEM: Sentence 1: A muzzled greyhound dog is running around a track. Sentence 2: A racing dog is chasing a toy that looks like a rabbit.

SOLUTION:
A dog is moving around.