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 white cat standing on a carpet. Sentence 2: A sheep standing in a forest.
0

Sentence 1: Two men compete in a tire rolling race. Sentence 2: Two people flipped tractor tires in a race.
3

Sentence 1: Nobel author Doris Lessing dies at 94 Sentence 2: Nobel laureate Doris Lessing dies at 94

5