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 man walking down the stairs. Sentence 2: A man walks down a staircase.
Example Output: 5

Example Input: Sentence 1: A woman is dancing by a fire. Sentence 2: A woman is taking a bath.
Example Output: 1

Example Input: Sentence 1: How exactly is Germany being 'punished' for the stupidity of WW? Sentence 2: How exactly are they being punished?
Example Output:
1