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 female applies something to he hair with her hands. Sentence 2: A cat is eating a slice of watermelon.
Example Output: 0

Example Input: Sentence 1: A animal is eating. Sentence 2: The animal is hopping.
Example Output: 0

Example Input: Sentence 1: But we can't do it without help. Sentence 2: We can't do it without you."
Example Output:
4