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.

[EX Q]: Sentence 1: Punk rock teenager walks with a mean look on his face. Sentence 2: The angry teenager had a mean look on his face.
[EX A]: The teenager walked with a mean look on his face.

[EX Q]: Sentence 1: A male wearing yellow pants catches air as he snowboards down an empty mountain. Sentence 2: A snowboarder shows off a trick as he is filmed for a television commercial.
[EX A]: The man is snowboarding.

[EX Q]: Sentence 1: Several children standing in front of a building. Sentence 2: A group of children are standing in front of a tall apartment building.
[EX A]:
A tall building a with a group of children standing in front.