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: Two green and white trains sitting on the tracks. Sentence 2: Two green and white trains on tracks.

Answer: 4


Question: Sentence 1: Liquid ammonia leak kills 15 in Shanghai Sentence 2: Liquid ammonia leak kills at least 15 in Shanghai

Answer: 5


Question: Sentence 1: A little girl with a ribbon in her hair is picking her nose. Sentence 2: A little girl in a purple shirt and helmet is riding on a scooter.

Answer:
1