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