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: Cristiano Ronaldo hat-trick fires Portugal to 2014 World Cup finals Sentence 2: Ronaldo hat-trick fires Portugal to World Cup
[EX A]: 5

[EX Q]: Sentence 1: Clinton ready to fight for Obama Sentence 2: Clinton a tough act for Obama to follow
[EX A]: 1

[EX Q]: Sentence 1: those who ignore history are doomed to repeat it. Sentence 2: ooo strike TWO those who ignore history are doomed to repeat it.
[EX A]:
4