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: What isn't how what was sold? Sentence 2: It's not how it was sold, gb.
Example Output: 2

Example Input: Sentence 1: A group of river barges with trees in the background. Sentence 2: A young girl wearing a bike helmet with a bicycle in the background.
Example Output:
0