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: Liquid ammonia leak kills 15 in Shanghai Sentence 2: Liquid ammonia leak kills at least 15 in Shanghai
[EX A]: 5

[EX Q]: Sentence 1: amnesty international is a rights group based in london. Sentence 2: the international institute for strategic studies is located in london.
[EX A]: 1

[EX Q]: Sentence 1: A girl in riding gear sits atop a brown horse. Sentence 2: A girl in a red shirt is riding a brown horse.
[EX A]:
4