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: Panda's play on a swing. Sentence 2: A man is playing guitar.
Example Output: 1

Example Input: Sentence 1: Two people dressed in white standing on a grass field. Sentence 2: A person is standing underneath an overpass near a highway.
Example Output: 0

Example Input: Sentence 1: A bicycle is parked by a shop. Sentence 2: A green bike parked outside a book store.
Example Output:
4