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: Umm the California was a cargo ship I dont care what the article says. Sentence 2: The California was a cargo ship.
Example Output: 4

Example Input: Sentence 1: A woman is riding an elephant. Sentence 2: A man is lifting himself.
Example Output: 0

Example Input: Sentence 1: Lebanese Gunmen Clash Over Syria Crisis Sentence 2: Syrians hold solution to Syria crisis
Example Output:
1