//--------------------------------------------------------------------------
// Data Definition
// ===============
// A List-of-number is either
//      - empty list
//  or  - a structure consisting of
//          - first as int
//          - rest as List-of-number
//--------------------------------------------------------------------------
struct ListOfNumber
{
    int          first;
    ListOfNumber *rest;
};

//---------------
// Data Example
//---------------
extern ListOfNumber *empty;
extern ListOfNumber list1;
extern ListOfNumber list2;
extern ListOfNumber list3;
extern ListOfNumber list4;
extern ListOfNumber list5;

//-------------
// Prototypes
//-------------
int nNode(ListOfNumber * L);