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: Australia to scrap soaring national debt ceiling Sentence 2: Australian PM insists no argument with Indonesia

A: 0
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Q: Sentence 1: A man is adding oil to car. Sentence 2: A man is putting anti-freeze into a car.

A: 2
****
Q: Sentence 1: Cyclopes don't exist - fine. Sentence 2: Goblins don't exist - fine.

A:
2
****