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: Obama widens lead over Romney despite jobs data: Reuters/Ipsos poll Sentence 2: Romney takes lead over Obama with convention "bounce": Reuters/Ipsos poll
[EX A]: 1

[EX Q]: Sentence 1: A person is squeezing through an opening in the rock face. Sentence 2: A medium sized brown dog is running through an open white wooded area.
[EX A]: 0

[EX Q]: Sentence 1: Annika Sorenstam gets her first opportunity to test that objective this week at the McDonald's LPGA Championship. Sentence 2: The appetizer devoured, Annika Sorenstam moves on to the entree this week at the McDonald's LPGA Championship.
[EX A]:
3