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 little girl walks on a boardwalk with blue domes in the background. Sentence 2: A man going over a jump on his bike with a river in the background
Example Output: 0

Example Input: Sentence 1: Obama moves to fill Fed board, taps Fischer to be No. 2 Sentence 2: Obama voices willingness to talk with GOP on budget
Example Output: 0

Example Input: Sentence 1: 9 killed, 168 injured in latest Cairo clashes Sentence 2: 10 killed, 12 injured in E. Afghan airport suicide blast
Example Output:
1