Evaluate the similarity between them and classify them into classes from 0-5 as follows:
0 : The two sentences are completely dissimilar.
1 : The two sentences are not equivalent, but are on the same topic.
2 : The two sentences are not equivalent, but share some details.
3 : The two sentences are roughly equivalent, but some important information differs/missing.
4 : The two sentences are mostly equivalent, but some unimportant details differ.
5 : The two sentences are completely equivalent, as they mean the same thing.

[EX Q]: Sentence 1: Scenario A assumes that the CO growth rate accelerates by .%/yr. Sentence 2: It assumes that methane growth rate accelerates by .%/yr.
[EX A]: 2

[EX Q]: Sentence 1: Yes, they are both different. Sentence 2: Opinions are different.
[EX A]: 1

[EX Q]: Sentence 1: Four blue and yellow planes flying over four boats. Sentence 2: Four blue and yellow planes in flight.
[EX A]:
4