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

Sentence 1: Bassenthwaite is not as frequently visited as some of the other lakes there is no ferry service and water activities are restricted. Sentence 2: There are no ferry services on the lake.
yes

Sentence 1: Several security managers told us that, in addition to reading current professional literature, their involvement with professional organizations was a valuable means of learning about the latest monitoring tools and research efforts. Sentence 2: Learning about the latest monitoring tools by being in contact with professional organizations is a stratagem used by several security managers.

yes