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Set Comprehensions

Set comprehensions work almost exactly the same way as list comprehensions, except that the result is a set (where repeated elements are not allowed) and it's expressed using curly braces:

champions = [
(2014, 'San Antonio Spurs'),
(2015, 'Golden State Warriors'),
(2016, 'The Cleveland Cavaliers'),
(2017, 'Golden State Warriors'),
(2018, 'Golden State Warriors'),
for team in {c[1] for c in champions}: # unordered
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