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: 3 Suspects Taken Into Custody in Boston Bombing Case Sentence 2: Boston police say 3 taken into custody in Marathon bombing

SOLUTION: 5

PROBLEM: Sentence 1: And I'm your friend Mitt. Sentence 2: Your good friend Mitt.

SOLUTION: 4

PROBLEM: Sentence 1: The blue-chip Dow Jones industrial average eased 44 points, or 0.47 percent, to 9,543, after scoring five consecutive up sessions. Sentence 2: The Dow Jones industrial average .DJI rose 18.25 points, or 0.19 percent, to 9,586.71.

SOLUTION:
2