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: 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: 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: Clinton calls for friends of Syria to unite Sentence 2: Plastic artist calls for greater support for new talents
Example Output:
0