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: Ex-first lady Barbara Bush leaves Texas hospital Sentence 2: Former first lady Barbara Bush leaves hospital

A: 5
****
Q: Sentence 1: The man is riding a horse. Sentence 2: A man is riding on a horse.

A: 5
****
Q: Sentence 1: If you leap up to make a hit, you're getting a penalty. Sentence 2: If your stick hits a guy in the face, you're getting a penalty.

A:
3
****