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: It even has a fortified head (cimorro) that is part of the city walls. Sentence 2: Part of the city walls is a fortified head.
Example Output: yes

Example Input: Sentence 1: Figure 2: Improved Government Operations Resulting From GAO Recommendations Sentence 2: Government operations are improved as a result of GAO recommendations.
Example Output:
yes