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Obtain the first word duplicated in a phrase.
let phrase: String = "If you know what you know if I..."
let words = phrase.split(separator: " ")
/// Check if a given word is includen in a string
/// before the own word.
func containsWord(_ word: String, offsetLimit limit: Int) -> Bool
return words.enumerated()
.filter({ $0.offset < limit })
.map({ String($0.element) })
for (index, word) in words.enumerated()
if containsWord(String(word), offsetLimit: index)
print("The first word duplicated is \(word)")
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