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: Fallen US firefighters brought home Sentence 2: Wall Street ends slightly lower
Example Output: 0

Example Input: Sentence 1: A badger is digging in the dirt. Sentence 2: A man is moving large rocks.
Example Output: 0

Example Input: Sentence 1: An overweight man is skipping rope. Sentence 2: A young man is dancing.
Example Output:
1