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.

Example Input: Sentence 1: The broader Standard & Poor's 500 Index <.SPX> gave up 11.91 points, or 1.19 percent, at 986.60. Sentence 2: The technology-laced Nasdaq Composite Index .IXIC declined 16.68 points, or 1.01 percent, at 1,636.94.
Example Output: 1

Example Input: Sentence 1: He told the jury Stubbs is a "cold, calculating killer." Sentence 2: District Attorney Dave Lupas reminded jurors that Stubbs is, "a cold, calculating killer".
Example Output: 3

Example Input: Sentence 1: A black dog is walking on the grass with a stick in it's mouth. Sentence 2: A boy holds a net with a snake in it close to the ground.
Example Output:
0