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.

Example Input: Sentence 1: A woman holding a small baby. Sentence 2: A smiling woman holding a small baby.
Example Output: 4

Example Input: Sentence 1: A women sitting in a chair at Christmas holding make up. Sentence 2: A train sitting on the tracks in a train yard.
Example Output: 0

Example Input: Sentence 1: World's oldest person dies in Japan at 116 Sentence 2: Jiroemon Kimura: World's oldest person dies aged 116
Example Output:
5