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: Syrian opposition offers Assad truce in Homs for duration of Ramadan Sentence 2: Syrian opposition offers Assad's forces truce for duration of Ramadan
Example Output: 5

Example Input: Sentence 1: A man is cutting a rope with a sword. Sentence 2: The man slced through a thick rope with a sword.
Example Output: 4

Example Input: Sentence 1: US stocks tumble on third day of shutdown Sentence 2: Stocks fall on third day of government shutdown
Example Output:
5