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 dog with red ears is running in the snow. Sentence 2: a wet black dog with a red collar is in the river
1

Sentence 1: Peter Lyman and Hal Varian of Berkeley's School of Information Management and Systems say that information production has increased by 30 percent each year between 1999 and 2002. Sentence 2: That task appealed to two masters of the megabyte, Peter Lyman and Hal Varian, professors at the University of California-Berkeley's School of Information Management and Systems.
2

Sentence 1: There are now 37 active probable cases in the GTA, compared with 70 cases on June 6. Sentence 2: And, globally, the number of active probable cases has declined to 573.

2