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.

Q: Sentence 1: The man hit the other man with a stick. Sentence 2: The man spanked the other man with a stick.

A: 4
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Q: Sentence 1: A girl is styling her hair. Sentence 2: A girl is filing her nails.

A: 1
****
Q: Sentence 1: Barrick in talks with China firm over African assets Sentence 2: Obama aide holds talks in China after Syria veto

A:
1
****