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: There are in fact four separate schools within the structure and each one has its own portal and inner courtyard. Sentence 2: Each of the four schools has its own portal and courtyard.
Example Output: yes

Example Input: Sentence 1: The trend is called brachycephalization, and it has been happening mainly in rural Poland between the Carpathian Mountains and the Black Sea--which, for some arcane reason, is one of the few places on Earth where humans are still evolving. Sentence 2: The humans in rural Poland have evolved a third arm.
Example Output: no

Example Input: Sentence 1: Based on the estimated time periods needed to complete each of the four phases described above, the estimated time period to complete the implementation of ACI on one combustion unit is about 15 months, as shown in Exhibit A-5 in Appendix A. Since the permitting process limits the timeline, a faster permitting process will shorten the time necessary to install ACI on a single unit. Sentence 2: the time period to complete the ACI implementation is an estimate.
Example Output:
yes