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: The skinny cows are standing on the grass. Sentence 2: The white ducks are standing on the ground.

A: 1
****
Q: Sentence 1: They know that the video doesn't show a gas chamber. Sentence 2: The bottom line is that the video clip doesn't show a gas chamber.

A: 5
****
Q: Sentence 1: The Nasdaq had a weekly gain of 17.27, or 1.2 percent, closing at 1,520.15 on Friday. Sentence 2: The tech-laced Nasdaq Composite .IXIC rallied 30.46 points, or 2.04 percent, to 1,520.15.

A:
2
****