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My instances are unordered collections of objects. You can think of me as a set with a memory; that is, if the same object is added to me twice, then I will report that that element has been stored twice.
| • Bag class-basic: | (class) | |
| • Bag-adding: | (instance) | |
| • Bag-enumerating the elements of a collection: | (instance) | |
| • Bag-extracting items: | (instance) | |
| • Bag-printing: | (instance) | |
| • Bag-removing: | (instance) | |
| • Bag-storing: | (instance) | |
| • Bag-testing collections: | (instance) |