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 Input:
Sentence 1: A man is paddling a canoe. Sentence 2: A man is playing a harp.

Ex Output:
1


Ex Input:
Sentence 1: Black train on train tracks. Sentence 2: A train on the train tracks.

Ex Output:
4


Ex Input:
Sentence 1: Dozens killed in Nigerian riots Sentence 2: Dozens killed in Kenyan clashes

Ex Output:

1