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: The woman is peeling shrimp. Sentence 2: The man is holding a lemur.
0

Sentence 1: Martin said, "Why are you following me?" Sentence 2: Zimmerman replied, "What are you doing here?"
1

Sentence 1: Civilian, defector killed in Syria, says NGO Sentence 2: Syria gunmen kill three Syrian officers: NGO

1