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.
--------
Question: Sentence 1: US Cannot 'Conclusively Determine' Chemical Weapons Use in Syria Sentence 2: U.S. Sees No Conclusive Evidence of Chemical Arms Use by Syria

Answer: 5


Question: 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.

Answer: 5


Question: Sentence 1: Enron's 401(k) plan covered about 20,000 workers, retirees and beneficiaries. Sentence 2: Enron's stock comprised as much as 61% of the workers' 401(k) portfolios.

Answer:
2