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.

Ex Input:
Sentence 1: South Africa has the world's highest caseload with 4.7 million people infected with HIV or AIDS. Sentence 2: With 4.7 million people infected with HIV or AIDS, South Africa has the world's highest AIDS caseload.

Ex Output:
5


Ex 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

Ex Output:
5


Ex Input:
Sentence 1: The broad Standard & Poor's 500 Index .SPX inched up 3 points, or 0.32 percent, to 970. Sentence 2: The technology-laced Nasdaq Composite Index .IXIC lost 2 points, or 0.18 percent, to 1,649.

Ex Output:

1