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: Obama moves to fill Fed board, taps Fischer to be No. 2 Sentence 2: Obama voices willingness to talk with GOP on budget
Example Output: 0

Example Input: Sentence 1: A woman is brushing some shrimp. Sentence 2: A woman brushes some shrimp.
Example Output: 5

Example Input: Sentence 1: Two people sitting at a table at a restaurant. Sentence 2: four people sitting at a table.
Example Output:
2