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| extension Sequence where Element: Hashable { | |
| func frequencies() -> [Element : Int] { | |
| return Dictionary(map { ($0, 1) }, uniquingKeysWith: { $0 + $1 }) | |
| } | |
| } | |
| assert("hello".frequencies() == ["e": 1, "o": 1, "l": 2, "h": 1]) |
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