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@@ -83,6 +83,7 @@ The possible roles are:
* **Monadic**: Called with one argument, either always (a monadic function) or in a particular instance (a monadic call).
* **Dyadic**: Called with two arguments, always or in a particular instance.
+* **Compound function**: A derived function or train.
* **Derived function**: A function produced by binding operands to a deferred modifier; doing so does not cause any computation.
* [**Train**](train.md): A function composed of two or more functions.
* [**Identity value**](fold.md#identity-values): An inferred property of a function: the result of a reduction with this function on an empty array.