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: Two brown dogs are biting each other. Sentence 2: Two brown dogs biting each other on sand.
Example Output: 4

Example Input: Sentence 1: A dog is jumping over a barrier at a agility competition. Sentence 2: A dog jumping over an obstacle course fence.
Example Output: 4

Example Input: Sentence 1: A man riding a white horse in an arena. Sentence 2: A man riding a white horse.
Example Output:
4