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In analogy to lists, the following classes of operations on structures
exist:
- construction: struct
struct creates a structure with arity ; functor
and arguments are on the stack
- selection: functor, arity, elt
with functor and arity, the functor and the arity of a
structure are determined; elt expects a structure and a number
on the stack and determines the 
argument of the structure,
where the first argument is counted as the 
argument
- test: structp
structp tests for a structure
