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: A man in swimming trunks is standing against some rocks. Sentence 2: A man in a gray shirt climbs a large rock wall.
1

Sentence 1: A field of black faced sheep. Sentence 2: A black faced sheep.
3

Sentence 1: A kangaroo is eating. Sentence 2: Kangaroo eating.

5