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: A woman is riding an elephant. Sentence 2: A man is lifting himself.
[EX A]: 0

[EX Q]: Sentence 1: Is Madeleine McCann Still Alive? Sentence 2: Reopen Madeleine case, police urge
[EX A]: 1

[EX Q]: Sentence 1: I think it should have been released years ago, said Brian Rohrbough, whose son, Daniel, was killed at Columbine. Sentence 2: Brian Rohrbough, whose son, Daniel, was killed at Columbine, said the tape raises disturbing issues.
[EX A]:
2