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 black and white photo of a cat lying down. Sentence 2: A black and white image of a cat laying on a rug.
Example Output: 4

Example Input: Sentence 1: The man hit the other man with a stick. Sentence 2: The man spanked the other man with a stick.
Example Output: 4

Example Input: Sentence 1: a boy swinging on a swing. Sentence 2: The girl is on a swing.
Example Output:
2