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: Two people are walking through some water. Sentence 2: Two girls are walking by a tree in front of a brick building.

A: 1
****
Q: Sentence 1: john duncan is great britain's ambassador for multilateral arms control and disarmament. Sentence 2: at un assembly chinese government urges increased efforts toward global arms control and disarmament.

A: 1
****
Q: Sentence 1: A passenger train waiting in a station. Sentence 2: A passenger train sits in the station.

A:
5
****