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 blue bird perches on the gloved hand of a person. Sentence 2: A bird is perched on a person's gloved hand.
Example Output: 4

Example Input: Sentence 1: 2 of the individuals arrested were released. Sentence 2: 2 of the zambians arrested are juveniles.
Example Output: 2

Example Input: Sentence 1: 18 killed, 108 wounded in wave of bombings in Iraq Sentence 2: 9 killed, 31 wounded in car bombs in Iraq's Kirkuk
Example Output:
1