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.

Q: Sentence 1: A group of penguins is walking. Sentence 2: A large amount of penguins are heading to the ocean.

A: 3
****
Q: Sentence 1: A large tan dog is running with a green item in its mouth Sentence 2: The tan dog is carrying a green squeak toy in its mouth.

A: 4
****
Q: Sentence 1: UN Chief Finds His Voice, Remains Cautious on China Sentence 2: Insight: U.N. chief finds his voice, but remains cautious on China

A:
5
****