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: Citicorp could have agreed to market Travelers insurance or Salomon brokerage services, and vice versa, without actually becoming one company. Sentence 2: Citicorp had the opportunity to market the insurance companies without merging.
Example Output: yes

Example Input: Sentence 1: when was that on Sentence 2: When did it come on?
Example Output: yes

Example Input: Sentence 1: Tommy Beresford. Sentence 2: Tommy Beresford is a man. 
Example Output:
no