TASK DEFINITION: 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.
PROBLEM: Sentence 1: Prince is replacing Sanford "Sandy" Weill, who will remain Citigroup's chairman. Sentence 2: Prince, who heads Citigroup's global corporate and investment bank, is replacing Sanford Weill as CEO.

SOLUTION: 3

PROBLEM: Sentence 1: X'mas cruise passengers hit by Norovirus Sentence 2: Missing cruise passenger is a NSW ambo

SOLUTION: 0

PROBLEM: Sentence 1: Mr. Grassley and Mr. Baucus rejected any disparity in drug benefits. Sentence 2: Grassley and Baucus said they had rejected that approach in their plan.

SOLUTION:
3