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: Liquid ammonia leak kills 15 in Shanghai Sentence 2: Liquid ammonia leak kills at least 15 in Shanghai
Example Output: 5

Example Input: Sentence 1: Full Episode: Nightline 6/29: Katie Holmes, Tom Cruise to Divorce Sentence 2: Custody, images at stake in Cruise-Holmes divorce
Example Output: 1

Example Input: Sentence 1: Avengers sets box office record Sentence 2: The Hunger Games breaks US box office record
Example Output:
1