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: Bradley Manning-WikiLeaks case turns to sentencing Sentence 2: Manning WikiLeaks case turns to sentencing phase
Example Output: 5

Example Input: Sentence 1: The cat played with a watermelon. Sentence 2: A cat is playing with a watermelon.
Example Output: 5

Example Input: Sentence 1: A black, brown and white dog running through a field. Sentence 2: A white and brown dog runs in a field.
Example Output:
3