TASK DEFINITION: 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.
PROBLEM: Sentence 1: Someone standing on a snowy mountain, watching a plane. Sentence 2: A man stands on a mountain, watching a plane.

SOLUTION: 4

PROBLEM: Sentence 1: A woman is cooking something. Sentence 2: A woman is pouring ingredients into a frying pan.

SOLUTION: 3

PROBLEM: Sentence 1: South African icon Nelson Mandela hospitalized Sentence 2: South Africa's Nelson Mandela Hospitalized

SOLUTION:
5