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.

Q: Sentence 1: Two workers face each other wearing green attire. Sentence 2: Two workers are wearing green clothing which is their uniform.

A: Two workers are wearing green clothing.
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Q: Sentence 1: A brown dog is laying on its back on the grass with a ball in its mouth. Sentence 2: The dog is playful.

A: A dog is on the grass with his toy.
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Q: Sentence 1: A greyhound dog race is happening at the track. Sentence 2: A big greyhound dog race is happening at the track.

A:
A dog race is happening at the track.
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