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: Liquid ammonia leak kills 15 in Shanghai Sentence 2: Liquid ammonia leak kills at least 15 in Shanghai

Ex Output:
5


Ex Input:
Sentence 1: Schools that fail to meet state goals for three years in a row must offer tutoring in addition to transfers. Sentence 2: Schools that don't meet the testing goals for two years in a row must offer transfers.

Ex Output:
3


Ex Input:
Sentence 1: A person breaks an egg into a small bowl. Sentence 2: A man cracks an egg.

Ex Output:

3