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: Passed in 1999 but never put into effect, the law would have made it illegal for bar and restaurant patrons to light up. Sentence 2: Passed in 1999 but never put into effect, the smoking law would have prevented bar and restaurant patrons from lighting up, but exempted private clubs from the regulation.

Ex Output:
3


Ex Input:
Sentence 1: A man riding a white horse in an arena. Sentence 2: A man riding a white horse.

Ex Output:
4


Ex Input:
Sentence 1: A group of people in front of a red fire truck. Sentence 2: A group of people are standing around a red fire truck.

Ex Output:

4