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 boy is pushing a van. Sentence 2: A person is slicing a tomato.
[EX A]: 0

[EX Q]: Sentence 1: Someone is playing piano. Sentence 2: A person is playing a keyboard piano.
[EX A]: 4

[EX Q]: Sentence 1: Thousands rally to support embattled Tunisia government Sentence 2: Thousands gather to support Islamist government in Tunisia
[EX A]:
5