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
****
Q: Sentence 1: Train in a station. Sentence 2: Trains inside an indoor station.

A: 4
****
Q: Sentence 1: Imagine a place that's % white and % black. Sentence 2: Imagine a place with % men and % women.

A:
1
****