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.
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Question: Sentence 1: A man walking down the stairs. Sentence 2: A man walks down a staircase.

Answer: 5


Question: Sentence 1: A small black dog is in the grass. Sentence 2: A black dog is running in the grass.

Answer: 4


Question: Sentence 1: It's so stupid that it just has to be true. Sentence 2: It's amusing to think it even might be true.

Answer:
3