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: Two constructions workers sit on a beam taking a break. Sentence 2: The man is putting on his shirt near an elevator.
Example Output: 0

Example Input: Sentence 1: Shares of SCO closed at $10.93, down 28 cents, in Monday trading on the Nasdaq Stock Market. Sentence 2: IBM shares closed up $1.75, or 2.11 percent, at $84.50 on the New York Stock Exchange.
Example Output: 1

Example Input: Sentence 1: The brown train is sitting on the railroad tracks. Sentence 2: The white train is sitting on the tracks.
Example Output:
2