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 black and white photo of a cat lying down. Sentence 2: A black and white image of a cat laying on a rug.
Example Output: 4

Example Input: Sentence 1: Plastic toys are floating in water. Sentence 2: The ladies are performing a dance.
Example Output: 0

Example Input: Sentence 1: A small kitten is playing a ball. Sentence 2: A kitten is playing with a ball.
Example Output:
4