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: A large tan dog is running with a green item in its mouth Sentence 2: The tan dog is carrying a green squeak toy in its mouth.

SOLUTION: 4

PROBLEM: Sentence 1: Mr Colpin did not specify whether it was this system that was at the centre of the investigation. Sentence 2: Neither OLAF nor the Belgian prosecutors have specified if it was this system that was at the centre of the investigation.

SOLUTION: 2

PROBLEM: Sentence 1: Out of touch and completely untrustworthy, however, wouldn't. Sentence 2: Out of touch and untrustworthy?

SOLUTION:
4