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 plane being readied for take-off. Sentence 2: A small turboprop plane being loaded on the tarmac.
Example Output: 3

Example Input: Sentence 1: Two soccer players battle for the ball during an intense match. Sentence 2: Two little orange and white dogs are in the snow.
Example Output: 0

Example Input: Sentence 1: The man is sitting with a little girl in the park. Sentence 2: The man is playing with the shaggy little dog.
Example Output:
1