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: A young boy jumps into a pool with outstretched arms. Sentence 2: A dog jumps into a backyard pool.
Example Output: 1

Example Input: Sentence 1: A person is slicing onions. Sentence 2: A person is peeling an onion.
Example Output: 3

Example Input: Sentence 1: A girl is communicating with sign language. Sentence 2: A young girl is using sign language.
Example Output:
4