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 girl riding on a brown and white horse. Sentence 2: A girl riding a brown horse.
Example Output: 4

Example Input: Sentence 1: h and i both read the books and thought the movie moved so quickly. Sentence 2: I haven't read the books, but I saw the movie today.
Example Output: 3

Example Input: Sentence 1: Three children in a ball pit. Sentence 2: Several children playing in a ball pit.
Example Output:
3