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: For those who want a slightly more challenging walk, but without a lot of hills to walk up and down, there are a number of routes in the Lake District with little or no gradient. Sentence 2: The Lake District is too strenuous for most people.
Example Output: yes

Example Input: Sentence 1: In addition, current law tends to address each environmental problem independently, even if one pollutant contributes to several problems. Sentence 2: The current way that the law sets up ignores the fact that one pollutant could cause many problems, and it instead focuses on each environmental problem on its own, which could be a problem in figuring out ways to solve environmental issues.,
Example Output:
no