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: Zimmerman says that he was sucker punched by his car. Sentence 2: His "friends" say that he was confronted by his car.
Example Output: 2

Example Input: Sentence 1: A person is folding a square paper piece. Sentence 2: A man is folding paper.
Example Output: 3

Example Input: Sentence 1: A close-up of a black train engine. Sentence 2: Close up of a white sheep with a black head.
Example Output:
0