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 little white curly haired dog runs across the pavement with a stick in its mouth. Sentence 2: A white curly haired dog runs with a stick in it's mouth.
Example Output: 5

Example Input: Sentence 1: 2 dead, 2 injured in Nevada middle school shooting Sentence 2: Nevada: 2 dead, 2 hurt in middle school shooting
Example Output: 5

Example Input: Sentence 1: Security lights have also been installed and police have swept the grounds for booby traps. Sentence 2: Security lights have also been installed on a barn near the front gate.
Example Output:
3