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.

Sentence 1: A man and a woman laughing. Sentence 2: A man and a woman kiss.
1

Sentence 1: A black and white image of a cat laying on a rug. Sentence 2: Black and white picture of a cat laying on a rug.
5

Sentence 1: The Dow Jones industrial average <.DJI> added 28 points, or 0.27 percent, at 10,557, hitting its highest level in 21 months. Sentence 2: The Dow Jones industrial average <.DJI> rose 49 points, or 0.47 percent, to 10,578.

2