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 brown dog is splashing water everywhere by shaking the water off of itself. Sentence 2: A white dog is standing by a river shaking himself dry.
Example Output: 2

Example Input: Sentence 1: A man drove his car. Sentence 2: A man is driving a car.
Example Output: 4

Example Input: Sentence 1: A woman is chopping an onion. Sentence 2: A woman is slicing partially into half of an onion.
Example Output:
3