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 girl is playing a flute. Sentence 2: A band is playing on a stage.
[EX A]: 1

[EX Q]: Sentence 1: Boy with glasses typing on a computer. Sentence 2: A boy looking at a computer screen.
[EX A]: 3

[EX Q]: Sentence 1: Gunmen ambush police boat in Nigeria oil region Sentence 2: Sudanese police block protest at human rights commission
[EX A]:
0