Detailed Instructions: 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: He noted that this rock-hewn cave matched very well the description of Jesus's tomb; a skull-like hill nearby strengthened Gordon's belief in its authenticity. Sentence 2: He was certain that the site was not authentic.
A:
yes