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 lady dressed in a kimono is looking at the camera. Sentence 2: Two girls dressed in black are sitting in a room making suggestive poses at the camera.
Example Output: 1

Example Input: Sentence 1: A girl makes up her bed. Sentence 2: A young girl makes her bed.
Example Output: 4

Example Input: Sentence 1: American Airlines and Pilots Agree on a New Contract Sentence 2: Romney pledges to 'stand with Israel' on Iran threat
Example Output:
0