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Answers and rating deltas for

How can i Modify the given code so that the final list only contains a single copy of each letter?

Author Votes Δ
abhiarora 2 +0.85
Austin 2 +0.28
soheshdoshi 1 +0.88
RMPR 1 +0.38
Sharyar Vohra 0 -2.60
Harsha Biyani 0 -0.67
mohammed wazeem 0 -2.39
Last visited: Sep 5, 2020, 12:36:14 PM