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

Example Input: Sentence 1: A man is chopping butter into a container. Sentence 2: A woman is cutting shrimps.
Example Output: 1

Example Input: Sentence 1: A big green ball knocks a potato over. Sentence 2: A large green ball hits a potato.
Example Output:
4