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 young boy laying on a sofa with a dog. Sentence 2: A small boy laying on a sofa with a dog.
Example Output: 5

Example Input: Sentence 1: A bloody man and woman pose for a picture. Sentence 2: A man in woman dressed warmly pose for a picture.
Example Output: 2

Example Input: Sentence 1: US releases initial report on fracking impacts on water Sentence 2: Men in China detained after taking girls to hotel
Example Output:
0