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1. one
2. Nil. $^{[[Features|2]]}$ In this example, $\rm Nil$ is assumed to be a subtype of $\tt List$.
3. inheritance. $^{[[Inheritance|3]]}$ Some object-oriented languages allow a class to inherit from multiple classes, which is equally aptly called "multiple inheritance."
4. object. ^4^ A shallow copy of $a$ copies $a$ itself, but does not recursively copy objects that $a$ points to.
5. void. ^5^

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