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: The man is riding a bike down a dirt hill. Sentence 2: A trick bicyclist grinds down a handrail.

A: 2
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Q: Sentence 1: I think you are missing the point with entrepreneurs. Sentence 2: Again I think you are missing the point on the Twain quote.

A: 1
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Q: Sentence 1: A man on the back seat of a red tandem bicycle. Sentence 2: A man is alone on the back of a tandem bicycle.

A:
4
****