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: tin foil hat for the dog face, what size do u wear? Sentence 2: tin foil hat for the sarg, what size do u wear?

A: 3
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Q: Sentence 1: A boy is playing with a toy. Sentence 2: A boy plays a handheld game.

A: 3
****
Q: Sentence 1: A cheetah is running. Sentence 2: A cheetah is running across a field.

A:
4
****