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: A group of youngsters swim in lake water Sentence 2: Many children are playing and swimming in the water.
[EX A]: 4

[EX Q]: Sentence 1: A girl is styling her hair. Sentence 2: A girl is filing her nails.
[EX A]: 1

[EX Q]: Sentence 1: 5 aid workers freed in operation in Afghanistan Sentence 2: Suicide bomber kills 37 at mosque in Afghanistan
[EX A]:
1