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.

Sentence 1: wen states that the main purpose of the germany visit is to advance trade, economic and technological exchanges. Sentence 2: wen stated that the purpose of his visit to germany is to advance trade, economic and technological exchanges.
5

Sentence 1: Three women are dancing. Sentence 2: The man is dancing.
2

Sentence 1: A boy is singing and playing the piano. Sentence 2: A boy is playing the piano.

3