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@@ -513,3 +513,7 @@ void bag::operator +=(const bag& addend){
- The array
- A variable to keep track of how much of the array is being used
- At the top of the implementation file: When you design a class, always make an explicit statement of the rules (**invariant of the class**) that dictate how the member variables are used
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+---
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+[01/21 ->](01-21.md)