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 people are firing up a hot air balloon. Sentence 2: A large group of people riding brown and white horses.

A: 0
****
Q: Sentence 1: A man is tying his shoe. Sentence 2: A man ties his shoe.

A: 5
****
Q: Sentence 1: A little girl holds a wooden stick. Sentence 2: A little girl swimming in a pool.

A:
2
****