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: And I'm your friend Mitt. Sentence 2: Your good friend Mitt.
4

Sentence 1: A girl riding on a brown and white horse. Sentence 2: A girl riding a brown horse.
4

Sentence 1: The man set up his camera to take sunset pictures at the beach. Sentence 2: A man is taking pictures of a lake.

2