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.

[EX Q]: Sentence 1: Originally the post was simply an inter-city letter service. Sentence 2: The post used to be just for inter-city communications.
[EX A]: yes

[EX Q]: Sentence 1: Regional Modeling System for Aerosols and Deposition (REMSAD) Sentence 2: The system does not model deposition.
[EX A]: yes

[EX Q]: Sentence 1: yeah there's there's always a drawback to everything i mean i don't know well Sentence 2: There's always something negative with everything.
[EX A]:
yes