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 woman holding a small baby. Sentence 2: A smiling woman holding a small baby.

A: 4
****
Q: Sentence 1: The man cut some carpet with a knife. Sentence 2: A man is cutting carpet with a knife.

A: 5
****
Q: Sentence 1: A man is playing on his keyboard. Sentence 2: A man is playing a keyboard piano.

A:
4
****