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: Two dogs playing in the snow. Sentence 2: Two black dogs in the snow.
Example Output: 4

Example Input: Sentence 1: Taliban pose as 'attractive women, on Facebook for spying Sentence 2: Taliban soldiers posing as pretty women on Facebook to get troops' secrets
Example Output: 5

Example Input: Sentence 1: A black and white cat playing with a blanket. Sentence 2: A black and white cat gets into a basket of yarn.
Example Output:
2