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: A man is slicing cucumber with a knife. Sentence 2: A man is cooking a tortilla in a skillet.
Example Output: 1

Example Input: Sentence 1: The same survey a month ago had Street leading Katz 42 percent to 34 percent, with 21 percent undecided. Sentence 2: One month ago in the same poll, Katz was leading 46 to 40 percent.
Example Output: 2

Example Input: Sentence 1: Iraqi police opened fire in downtown Baghdad today after demonstrators stormed a police station demanding they be given jobs they claimed to have paid bribes for. Sentence 2: Iraqi police opened fire in downtown Baghdad Wednesday after demonstrators demanding jobs stormed a police station and threw stones at officers, police said.
Example Output:
3