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.

[EX Q]: Sentence 1: Revenue rose 3.9 percent, to $1.63 billion from $1.57 billion. Sentence 2: The McLean, Virginia-based company said newspaper revenue increased 5 percent to $1.46 billion.
[EX A]: 1

[EX Q]: Sentence 1: A boy is crawling into a dog house. Sentence 2: A cat is playing on the floor.
[EX A]: 0

[EX Q]: Sentence 1: the chinese government has strengthened china's anti-proliferation capacity in recent years. Sentence 2: the chinese government has strictly censored china's chemical imports and exports according to the law in recent years.
[EX A]:
1