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.

Example Input: Sentence 1: A young Asian girl is purchasing an item from a vending machine. Sentence 2: A girl is getting a soda from a vending machine.
Example Output: A girl is using a vending machine.

Example Input: Sentence 1: A group of people riding on a crowded bus. Sentence 2: The bus was full.
Example Output: People were on the bus.

Example Input: Sentence 1: A young girl watched as a girl younger than her climb a tree. Sentence 2: The girls are building a tree fort.
Example Output:
The girl watches another girl climb a tree.