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.

Q: Sentence 1: georgian government websites are under intense cyber attack following russian military strikes against georgia late last week. Sentence 2: the cyber attacks follow russian military strikes launched against georgia late last week.

A: 5
****
Q: Sentence 1: They know that the video doesn't show a gas chamber. Sentence 2: The bottom line is that the video clip doesn't show a gas chamber.

A: 5
****
Q: Sentence 1: A woman sings into a microphone by a guy playing a guitar. Sentence 2: A woman sings into a microphone with a guitar player in the background.

A:
4
****