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: Revenues for "The Hulk" came in well below those of last month's Marvel Comics adaptation, "X2: X-Men United," which grossed $85.6 million in its opening weekend. Sentence 2: The Hulk trailed last month's Marvel Comics adaptation, X2: X-Men United, which grossed $85.6-million in its opening weekend.

SOLUTION: 5

PROBLEM: Sentence 1: A dog rides a skateboard. Sentence 2: A dog is riding a skateboard.

SOLUTION: 5

PROBLEM: Sentence 1: Dozens killed in air strike on bakery in central Syria Sentence 2: 'Dozens killed' in Syrian air strike on bakery

SOLUTION:
5