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: Residents return to Texas blast site Sentence 2: Residents return to Fallujah
[EX A]: 0

[EX Q]: Sentence 1: Boy with glasses typing on a computer. Sentence 2: A boy looking at a computer screen.
[EX A]: 3

[EX Q]: Sentence 1: A large bird standing on a table picks up a plastic glass containing liquid and places it in a bowl of something. Sentence 2: A bird picks up a plastic cup containing a liquid with it's beak and puts the cup into a bowl.
[EX A]:
4