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.

[EX Q]: Sentence 1: The man is riding a bike down a dirt hill. Sentence 2: A trick bicyclist grinds down a handrail.
[EX A]: 2

[EX Q]: Sentence 1: The hedgehog chewed on the towel. Sentence 2: A hedgehog is biting at a blanket.
[EX A]: 3

[EX Q]: Sentence 1: Red double decker bus driving through the streets. Sentence 2: Double decker passenger bus driving with traffic.
[EX A]:
4