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: Page said it's also possible that genes on the Y chromosome may influence gender-specific differences in disease susceptibility. Sentence 2: He added that genes on the Y might play a role in influencing gender-specific differences in disease susceptibility.
Example Output: 4

Example Input: Sentence 1: A climber is standing on the rock face next to the pink rope. Sentence 2: The children are running in the snow with fences in the background.
Example Output: 0

Example Input: Sentence 1: Several dead, 550 injured in Argentina train crash Sentence 2: 49 feared dead in Buenos Aires train crash
Example Output:
1