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: NYPD Twitter Outreach Backfires Badly Sentence 2: NYPD's twitter campaign backfires
5

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.
4

Sentence 1: A Woman is eating. Sentence 2: A animal is eating.

2