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I have the questionable distinction of being a class with only one instance, which is the object "nil".
| • UndefinedObject-basic: | (instance) | |
| • UndefinedObject-class creation - alternative: | (instance) | |
| • UndefinedObject-class polymorphism: | (instance) | |
| • UndefinedObject-CObject interoperability: | (instance) | |
| • UndefinedObject-dependents access: | (instance) | |
| • UndefinedObject-iteration: | (instance) | |
| • UndefinedObject-printing: | (instance) | |
| • UndefinedObject-still unclassified: | (instance) | |
| • UndefinedObject-storing: | (instance) | |
| • UndefinedObject-testing: | (instance) |