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.

Example Input: Sentence 1: Becker, Howard S. Problems of Inference and Proof in Participant Observation. Sentence 2: Problems of Inference and Proof in Participant Observation is related to Howard Becker.
Example Output: yes

Example Input: Sentence 1: Ca'daan awoke and hid behind a bush to move his bowels. Sentence 2: Ca'daan was embarrassed abotu what he was doing.
Example Output: no

Example Input: Sentence 1: Performance improvements cited included increased efficiency and improved customer satisfaction. Sentence 2: All the customers said they were not satisfied.
Example Output:
yes