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

Sentence 1: A man is straining pasta. Sentence 2: A man plays a wooden flute.
0

Sentence 1: someone is slicing a vegetable. Sentence 2: Someone is slicing a tomato.

3