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: 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: Supplementary T and A records, containing information not previously discussed, shall be completed and maintained. Sentence 2: T and A records always contain information that has been discussed before.
Example Output: yes

Example Input: Sentence 1: The fruit and leaves feed crabs whose waste products in turn feed fish, prawns, and mollusks. Sentence 2: Without the crabs' waste, fish, mollusks, and prawns wouldn't have as much food.
Example Output:
no