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: elbaradei states that a middle east peace deal can only be reached in parallel with a security agreement based on eradicating all weapons of mass destruction from the region. Sentence 2: elbaradei was quoted as saying that a peace deal between israel and its arab neighbors must be reached in parallel with a security agreement based on eradicating all weapons of mass destruction from the region.
Example Output: 5

Example Input: Sentence 1: Let's let this play out in court. Sentence 2: Nothing is stopping this thing from playing out in court.
Example Output: 4

Example Input: Sentence 1: anatoly sokolov announced-- soviet-built a-135 missile defense system around moscow is obsolete and inefficient. Sentence 2: soviet-built a-135 missile defense system around moscow is obsolete and inefficient.
Example Output:
5