Definition: In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to determine if the two sentences clearly agree/disagree with each other, or if this can't be determined. Indicate your answer as yes or no respectively.
Input: Sentence 1: This notion argues that the postal service should charge competitors the same amount to use the delivery system that the postal service charges itself. Sentence 2: This argument says that when using the delivery system, the postal service should charge itself half of what it charges its competitors.
Output:
yes