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 holding a leaf. Sentence 2: A woman is watching television.
Example Output: 0

Example Input: Sentence 1: A close-up of an animal with a long face standing on grass near a tree. Sentence 2: A close-up of a woman with black boots next to a blue motorcycle.
Example Output: 0

Example Input: Sentence 1: Darren Dopp, a Spitzer spokesman, declined to comment late Thursday. Sentence 2: John Heine, a spokesman for the commission in Washington, declined to comment on Mr. Spitzer's criticism.
Example Output:
1