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: The woman is riding a horse. Sentence 2: A man is riding a horse in an arena.
Example Output: 2

Example Input: Sentence 1: It's so stupid that it just has to be true. Sentence 2: It's amusing to think it even might be true.
Example Output: 3

Example Input: Sentence 1: Twelve killed as gunmen raid village Sentence 2: Five Killed in Blasts in India
Example Output:
0