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: Algerian priest to lecture about Christian heritage in N. Africa Sentence 2: Telstra applies to list China site in NY

A: 0
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Q: Sentence 1: Seniors would then have to pay 50 percent of their drug costs up to $3,450. Sentence 2: Above that, Medicare would pay 90 percent of all drug costs.

A: 2
****
Q: Sentence 1: Two people sit on the end of a dock. Sentence 2: Two people sitting on a dock.

A:
4
****