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

Example Input: Sentence 1: A black and brown dog walks through the snow near a building. Sentence 2: An older man stands outside a old boarded up building.
Example Output: 1

Example Input: Sentence 1: Volume was moderate at 827.68 million shares, up from 798.95 million at the same point Tuesday. Sentence 2: Volume came to 439.66 million shares, below 450.39 million at the same point Wednesday.
Example Output:
2