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The module Procedure specifies operations on procedures.
IsProcedure
{Procedure.is+X?B}
tests whether X is a procedure.
ProcedureArity
{Procedure.arity+P?I}
returns the procedure arity of P, i. e., the number of arguments which P takes.
apply
{Procedure.apply+P+Xs}
applies the procedure P to the arguments given by the elements of the list Xs, provided that
{Procedure.arityP} == {LengthXs}
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