TASK DEFINITION: In this task, you're given a pair of sentences, sentence 1 and sentence 2, that agree with each other. Your job is to alter sentence 2 so that the pair 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: Policemen in riot gear, along with two police on horseback are charging a crowd that are behind a barrier. Sentence 2: Policemen are dealing with a crowd outside.

SOLUTION: Policemen in riot gear are raiding a house.

PROBLEM: Sentence 1: Black and brown dog growling at brown cat hiding under wooden bench. Sentence 2: Black and brown dog growling at brown cat

SOLUTION: Black and brown dog nursing brown cat

PROBLEM: Sentence 1: A group of people riding the subway both sitting and standing. Sentence 2: A group of people are riding the subway.

SOLUTION:
A group of people riding the airplane are both sitting and standing.