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 young boy laying on a sofa with a dog. Sentence 2: A small boy laying on a sofa with a dog.

A: 5
****
Q: Sentence 1: The broader Standard & Poor's 500 Index <.SPX> gave up 11.91 points, or 1.19 percent, at 986.60. Sentence 2: The technology-laced Nasdaq Composite Index .IXIC declined 16.68 points, or 1.01 percent, at 1,636.94.

A: 1
****
Q: Sentence 1: Two women contestants are walking their dogs in a dog show. Sentence 2: Two women walk there dogs at a dog show.

A:
5
****