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: Waves are additive. Sentence 2: Waves are not additive.
Example Output: yes

Example Input: Sentence 1: Tommy smiled at them encouragingly. Sentence 2: Tommy offered an encouraging grin.
Example Output: yes

Example Input: Sentence 1: Whether the voters deserve it or not, we're likely to hear a lot more in coming spots about which man is better--or worse. Sentence 2: We will likely hear about who is better or worse.
Example Output:
yes