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.

Sentence 1: A man is eating a banana by a tree. Sentence 2: A man is eating a banana.
4

Sentence 1: Man arrested over double murder Sentence 2: WA man arrested in police drug raid
1

Sentence 1: Syria denies reports of deadly Damascus nerve gas attack Sentence 2: US allies get help to repel Iranian computer attacks

0