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.

Sentence 1: (By contrast, Slate 's assessment relies entirely upon sources who are not identified by name.) Sentence 2: The names and origin of Slate's sources are not known.
yes

Sentence 1: And Lying ... Sentence 2: And lying is a bad thing.
no

Sentence 1: Meanwhile, Yugoslavia refused to let a U.N. war crimes official into the country to investigate the massacre. Sentence 2: Yugoslavia let the UN officer investigate. 

yes