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

Example Input: Sentence 1: A monkey pulls the tail of a dog. Sentence 2: A monkey is teasing a dog at the zoo.
Example Output: 3

Example Input: Sentence 1: Heather, 35, who lost a leg in a road accident, is thought to have steel plates fitted in her hips, which would make natural childbirth impossible. Sentence 2: Former model Lady McCartney lost a leg in a road accident in 1993 and is understood to have steel plates fitted in her hips which would make natural childbirth difficult.
Example Output:
2