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: The two dogs were in the pen. Sentence 2: The cowboy rode his horse in the desert.
0

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.
1

Sentence 1: The government does not determine if you are married or not. Sentence 2: The government doesnt have to declare you married before you can be married.

4