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: Several shots rang out in the darkness, but only one gator had been killed by 11 p.m. Sentence 2: Several shots rang out Wednesday night, but no gators were killed then.

SOLUTION: 2

PROBLEM: Sentence 1: a bird lands in the water. Sentence 2: a boat floats in the water.

SOLUTION: 1

PROBLEM: Sentence 1: Snowden Hits Hurdles in Search for Asylum Sentence 2: Snowden's hits hurdles in search for asylum

SOLUTION:
5