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: A small white cat standing in a sink. Sentence 2: Grey and white cat sitting in bathroom sink.

A: 4
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Q: Sentence 1: Cuba's 'Ladies' to pick up EU prize 8 years late Sentence 2: Cuba's 'Ladies' to Pick Up EU Prize 8 Years Later

A: 5
****
Q: Sentence 1: A young boy is riding a bike. Sentence 2: A young girl laying on a blue inflatable toy

A:
0
****