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: Two brown dogs are running through the grass. Sentence 2: Older dogs are playing around.

SOLUTION: Two dogs are running outside.

PROBLEM: Sentence 1: A man wearing blue jeans, blue shirt and a cap runs in front of a large truck on a street. Sentence 2: A man in blue jeans and a blue shirt is training for a marathan.

SOLUTION: A man runs on the street.

PROBLEM: Sentence 1: A young man holding a drink is going down a green escalator. Sentence 2: A young man is holding a cup of coffee in his hand.

SOLUTION:
A guy is holding a beverage.