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.

[EX Q]: Sentence 1: The UK population is just over  million. Sentence 2: The Japanese population is nearly  million.
[EX A]: 1

[EX Q]: Sentence 1: A field of black faced sheep. Sentence 2: A black faced sheep.
[EX A]: 3

[EX Q]: Sentence 1: The president began his speech by acknowledging the terrorist attacks in Saudi Arabia that killed at least 29 people, including seven Americans. Sentence 2: Bush, however, also lashed out at the terrorist bombings in Saudi Arabia that killed at least 29 people -- including a number of Americans.
[EX A]:
3