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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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