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: Someone drills a hole in a strip of wood with a power drill. Sentence 2: A man drills a hole in a piece of wood.
Example Output: 3

Example Input: Sentence 1: A man sharpens a pencil using a knife. Sentence 2: A woman is dancing in the rain.
Example Output: 0

Example Input: Sentence 1: Factory Fires Kill At Least 260 in Pakistan Sentence 2: At Least Six Dead in Pakistan Gunfight
Example Output:
1