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: Russ Britt is the Los Angeles Bureau Chief for CBS.MarketWatch.com. Sentence 2: Emily Church is London bureau chief of CBS.MarketWatch.com.
2

Sentence 1: Ex-first lady Barbara Bush leaves Texas hospital Sentence 2: Former first lady Barbara Bush leaves hospital
5

Sentence 1: Five cows are grazing beside the road. Sentence 2: Several sheep grazing in the field.

1