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: Lummox was his first brill, a gift from Ca'daan, and he didn't want to lose her. Sentence 2: Ca'daan gave him Lummox.
Example Output: yes

Example Input: Sentence 1: Our work also has shown that the international Sentence 2: Our work proves that the international...
Example Output: yes

Example Input: Sentence 1: He was placed in a zoo for safekeeping when the regiment went on to France, and in this period Winnie became a great favorite with the English zoo-going public. Sentence 2: Winnie was placed in a zoo in France for safekeeping. 
Example Output:
yes