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type intSet is intSet create(); insert(intSet,int); delete(intSet,int); bool member(intSet,int); int size(intSet); end intSet;

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interface: signature and specification implementation

Client A Client B Client C Client D Invokes Interface Realizes Interface Public & Stable Private & Changeable

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n double sqrt (int x)

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(intSet s,int i) { return IsOdd(i) }

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