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.

Q: Sentence 1: Smiling man with reflective classes. Sentence 2: A gentleman smiling and showing his reflective sunglasses.

A: 5
****
Q: 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.

A: 5
****
Q: Sentence 1: Five men in tuxedos are walking down steps. Sentence 2: Five men in tuxedos walk down a set of steps

A:
5
****