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 black and white dog looking at the camera. Sentence 2: A small black and white goat in a pen looking up at the camera.
Example Output: 1

Example Input: Sentence 1: The report ranked 45 large companies based on employment, marketing, procurement, community reinvestment and charitable donations. Sentence 2: Of those three, only Dillard's responded to the survey that ranked 45 large companies on employment, marketing, procurement, community reinvestment and charitable donations.
Example Output: 3

Example Input: Sentence 1: Boeing 787 Dreamliner catches fire; stock takes a beating Sentence 2: Boeing stock tumbles after fire on 787 Dreamliner
Example Output:
5