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.

Sentence 1: People with numbers on their chests are running in a pack. Sentence 2: Marathon runners end up grouped together after a collision between runners.
People in a race are grouped together.

Sentence 1: A man in a lab coat wearing glasses and looking at a computer monitor. Sentence 2: A tall human wearing glasses
A human wearing glasses

Sentence 1: adorable little girl with her hair pulled up, sitting in a baby swing with greenery in the background. Sentence 2: A child posing for her 1st birthday picture.

A child sitting in front of green plants.