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: Iraq Backs Egypt Crackdown on Morsi Supporters Sentence 2: Iraq backs Egypt crackdown on Mohamed Morsi supporters

SOLUTION: 5

PROBLEM: Sentence 1: A man wearing a orange vest is canoeing in the blue water. Sentence 2: A man in an orange jacket raising his hands to the sky in the sand.

SOLUTION: 2

PROBLEM: Sentence 1: Close up of a bottle of water. Sentence 2: A close up view of a bottle of water.

SOLUTION:
4