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.

Example Input: Sentence 1: More expensive homes. Sentence 2: More expensive cars.
Example Output: 1

Example Input: Sentence 1: amnesty international is a rights group based in london. Sentence 2: the international institute for strategic studies is located in london.
Example Output: 1

Example Input: Sentence 1: a brown double decker tour bus on a street with a ferris wheel behind it. Sentence 2: A double-decker bus driving in front of a ferris wheel.
Example Output:
4