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.
Example: Sentence 1: A plane is taking off. Sentence 2: An air plane is taking off.
Example solution: 5
Example explanation: Here both statements are talking about the same thing hence it will be classified as a 5.

Problem: Sentence 1: St. Paul Chairman and Chief Executive Jay S. Fishman, 51, will be CEO of the combined company. Sentence 2: Jay Fishman, 51, chairman and chief executive of St Paul, will be chief executive of the combined company.
Solution: 5