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: so what are the most important benefits to you Sentence 2: What is the best benefit? 
Example Output: no

Example Input: Sentence 1: Originally the post was simply an inter-city letter service. Sentence 2: The post used to be just for inter-city communications.
Example Output: yes

Example Input: Sentence 1: 'Good. Sentence 2: The food was good.
Example Output:
no