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: Egypt votes in new constitution Sentence 2: Egyptians Vote On New Constitution
Example Output: 5

Example Input: Sentence 1: How is this slanted against Bush?? Sentence 2: Where is the slant against Bush?
Example Output: 4

Example Input: Sentence 1: A woman is frying fish. Sentence 2: A woman is cooking fish.
Example Output:
4