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.

Q: Sentence 1: Jon spoke again, nodding his head slightly. Sentence 2: He was trying to convince them.

A: no
****
Q: Sentence 1: There was an enormous sphere of thin crystal to represent the sky. Sentence 2: The crystal is very expensive and precious.

A: no
****
Q: Sentence 1: I learnt afterwards that they nearly did away with me then and there there was never much chance of their 'letting me go' but the first man, who was the boss, preferred to keep me alive on the chance of my having hidden them, and being able to tell where if I recovered my memory. Sentence 2: The boss thought that I might be useful if my memory came back.

A:
yes
****