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: three little boys cover themselves with bubbles. Sentence 2: Three children standing by a pool are covered in foam bubbles.
Example Output: 4

Example Input: Sentence 1: wen states that the main purpose of the germany visit is to advance trade, economic and technological exchanges. Sentence 2: wen stated that the purpose of his visit to germany is to advance trade, economic and technological exchanges.
Example Output: 5

Example Input: Sentence 1: Originally Posted by anabelle What's wrong with that? Sentence 2: Originally Posted by Vienna To 'say' what?
Example Output:
0