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| func extend<T: Collection, U: Collection>(_ base: T, withNewElems: U) -> [T.Iterator.Element] | |
| where T.Iterator.Element == U.Iterator.Element, | |
| T.Iterator.Element: Equatable { | |
| let newElems = withNewElems.filter { !base.contains($0) } | |
| return Array(base) + newElems | |
| } |
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