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: The broader Standard & Poor's 500 Index .SPX was down 0.04 points, or 0 percent, at 971.52. Sentence 2: Standard & Poor's 500 stock index futures for June were down 2.60 points at 965.70, while Nasdaq futures were down 7.50 points at 1,183.50.
2

Sentence 1: Someone standing on a snowy mountain, watching a plane. Sentence 2: A man stands on a mountain, watching a plane.
4

Sentence 1: Two green birds fly towards a wooden telephone pole. Sentence 2: Two green birds flying above the telephone wires.

3