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.

Ex Input:
Sentence 1: A close-up of a sheep with its tongue hanging out. Sentence 2: Close up image of a sheep with it's tongue hanging out.

Ex Output:
5


Ex Input:
Sentence 1: Scenario A assumes that the CO growth rate accelerates by .%/yr. Sentence 2: It assumes that methane growth rate accelerates by .%/yr.

Ex Output:
2


Ex Input:
Sentence 1: Two cats sitting together on the sofa looking out the window. Sentence 2: Two cats are looking at a window.

Ex Output:

4