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 dog is jumping over a barrier at a agility competition. Sentence 2: A dog jumping over an obstacle course fence.
Example Output: 4

Example Input: Sentence 1: Cristiano Ronaldo hat-trick fires Portugal to 2014 World Cup finals Sentence 2: Ronaldo hat-trick fires Portugal to World Cup
Example Output: 5

Example Input: Sentence 1: The tech-loaded Nasdaq composite rose 20.96 points to 1595.91, ending at its highest level for 12 months. Sentence 2: The technology-laced Nasdaq Composite Index <.IXIC> climbed 19.11 points, or 1.2 percent, to 1,615.02.
Example Output:
2