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: Consider Input: Sentence 1: In providing services and in establishing classifications, rates, and fees under this title, the Postal Service shall not, except as specifically authorized in this title, make any undue or unreasonable discrimination among users of the mails, nor shall it grant any undue or unreasonable preferences to any such user. Sentence 2: Discrimination is preferred by the Postal Service.

Output: yes

Input: Consider Input: Sentence 1: but uh i guess the hardwoods are probably the biggest thing we have are our hard maple and hard oak and and the the evergreens Sentence 2: We also have a green, hard grassland.

Output: no

Input: Consider Input: Sentence 1: The perspective of the stages of change model appears to be an appealing one to help staff and interventionist under-stand the process of change for addictive and health behavior. Sentence 2: The stages of change model is ineffective for understanding the process of change.
Output: yes