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: 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.
Example Output: yes

Example Input: Sentence 1: This proved highly dangerous to pilgrims who approached the abbey across the sands (the causeway joining the island to the mainland was not built until 1874). Sentence 2: Many pilgrims perished en route to the abbey.
Example Output: no

Example Input: Sentence 1: The sinister prison of the Conciergerie ' named after the royally appointed concierge in charge of common-law criminals ' welcomed Marie-Antoinette, Robespierre, Madame du Barry, Danton, and 2,500 others into its antechamber of the guillotine.  Sentence 2: Robespierre was a French politician who was executed during the French Revolution.
Example Output:
no