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: Tokyo to host 2020 Olympic Games Sentence 2: Wrestling to feature in 2020 Tokyo Olympics
Example Output: 1

Example Input: Sentence 1: it will be hosted by the australian government. Sentence 2: the u.s. plans have angered the russian government.
Example Output: 0

Example Input: Sentence 1: A man playing a video game in a store. Sentence 2: Man playing game in a store.
Example Output:
3