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 man is carrying another man over his shoulder. Sentence 2: A man is carrying someone on his shoulder.
Example Output: 3

Example Input: Sentence 1: Five cows are grazing beside the road. Sentence 2: Several sheep grazing in the field.
Example Output: 1

Example Input: Sentence 1: Some men are skating on the road. Sentence 2: Two boys are skate boarding.
Example Output:
3