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: A brown dog is splashing water everywhere by shaking the water off of itself. Sentence 2: A white dog is standing by a river shaking himself dry.
[EX A]: 2

[EX Q]: Sentence 1: Man standing in front of silver train. Sentence 2: Man standing in front of a silver rail car.
[EX A]: 4

[EX Q]: Sentence 1: The broader Standard & Poor's 500 Index .SPX fell 3 points, or 0.30 percent, to 995. Sentence 2: The technology-laced Nasdaq Composite Index <.IXIC> added 1.92 points, or 0.12 percent, at 1,647.94.
[EX A]:
1