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.

Sentence 1: Usain Bolt wins 200m – Steven Howard reaction Sentence 2: Facebook mobile gains drive revenue growth: reaction
0

Sentence 1: A dog in in a car. Sentence 2: A dog is biting a mop.
1

Sentence 1: Two dogs on the beach. Sentence 2: A dog walks on the beach.

2