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.

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.
5

Sentence 1: Prince is replacing Sanford "Sandy" Weill, who will remain Citigroup's chairman. Sentence 2: Prince, who heads Citigroup's global corporate and investment bank, is replacing Sanford Weill as CEO.
3

Sentence 1: For me, the Lewinsky imbroglio seemed like just another vicious scandal manufactured by political opponents, according to extracts released yesterday. Sentence 2: For me, the Lewinsky imbroglio seemed like just another vicious scandal manufactured by political opponents, Mrs Clinton writes.

3