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: 6.6 quake rocks Indonesia's Papua: USGS Sentence 2: 6.6 quake rocks Indonesia's Papua: US Geological Survey
Example Output: 5

Example Input: Sentence 1: Soccer players are kicking a soccer ball into the goal. Sentence 2: A soccer player scores a goal.
Example Output: 4

Example Input: Sentence 1: A black cow and a brown cow stands in a plain in front of an uprooted tree. Sentence 2: A black cow and a brown cow standing in front of a small copse of trees in a field.
Example Output:
4