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: Japan's opposition party chief criticizes Abe's economic policies Sentence 2: Zimbabwe‚Äôs opposition MDC party challenges Robert Mugabe‚Äôs election win
Example Output: 0

Example Input: Sentence 1: A small plane parked at an airfield with a cloudy sky overhead. Sentence 2: A small white plane parked in an airport on a cloudy day.
Example Output: 5

Example Input: Sentence 1: P.G. police seeking driver in crash that killed child Sentence 2: Police seek gunmen in New Orleans Mother's Day parade shooting
Example Output:
0