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: French parliament backs reform of law on prostitution Sentence 2: Russian parliament to consider ban on U.S. adoptions
Example Output: 1

Example Input: Sentence 1: tin foil hat for the dog face, what size do u wear? Sentence 2: tin foil hat for the sarg, what size do u wear?
Example Output: 3

Example Input: Sentence 1: A white bus with the word Julia is near water and a big ship. Sentence 2: A white bus with water and a barge in the background.
Example Output:
4