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: Egypt's opposition criticizes president's speech Sentence 2: Pakistan's opposition party boycotts presidential elections
Example Output: 0

Example Input: Sentence 1: Kids play soccer on a field. Sentence 2: Three boys playing soccer in a field
Example Output: 4

Example Input: Sentence 1: A white plane on the runway. Sentence 2: A white airplane is on a runway.
Example Output:
5