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: Could be a lot of things. Sentence 2: Could be a simple mistake.

A: 2
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Q: Sentence 1: A man is riding a skateboard. Sentence 2: A woman is cutting a potato.

A: 0
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Q: Sentence 1: Unless it's different in different countries? Sentence 2: So, short form, yes, it probably is different in different countries.

A:
4
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