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.

Sentence 1: French parliament backs reform of law on prostitution Sentence 2: Russian parliament to consider ban on U.S. adoptions
1

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

Sentence 1: A person is folding a square paper piece. Sentence 2: A man is folding paper.

3