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: A television in a messy room with several bookcases. Sentence 2: A room with a television, stereo and bookshelf.
Example Output: 3

Example Input: Sentence 1: Man standing in front of silver train. Sentence 2: Man standing in front of a silver rail car.
Example Output: 4

Example Input: Sentence 1: Another said its members would continue to call the more than 50 million phone numbers on the Federal Trade Commission's list. Sentence 2: Meantime, the Direct Marketing Association said its members should not call the nearly 51 million numbers on the list.
Example Output:
2