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: john duncan is great britain's ambassador for multilateral arms control and disarmament. Sentence 2: at un assembly chinese government urges increased efforts toward global arms control and disarmament.
[EX A]: 1

[EX Q]: Sentence 1: A young boy laying on a sofa with a dog. Sentence 2: A small boy laying on a sofa with a dog.
[EX A]: 5

[EX Q]: Sentence 1: you have no remains of a missile at the pentagon. Sentence 2: you have no witnesses for a missile at the pentagon.
[EX A]:
3