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 Input:
Sentence 1: Two brown dogs are biting each other. Sentence 2: Two brown dogs biting each other on sand.

Ex Output:
4


Ex Input:
Sentence 1: Andy Murray deserves knighthood, David Cameron says Sentence 2: David Cameron: Andy Murray deserves a knighthood

Ex Output:
5


Ex Input:
Sentence 1: their vast properties are protected by the govt. Sentence 2: their great wealth is protected by the govt.

Ex Output:

3