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: Dog training on the mountain Sentence 2: A dog is taking a class.
A dog is on a mountain.

Sentence 1: A group of people sitting at a table together. Sentence 2: They are workign together
the peopel are sitting

Sentence 1: A group of men paint on a series of canvasses in front of a brick wall on a public street. Sentence 2: The men are all taking the same college art class.

Some men are painting on canvasses in public.