text: /*****************************************************************************
  *                                                                            *
  *  -------------------------------- cover.h -------------------------------  *
  *                                                                            *
  *****************************************************************************/
  
  #ifndef COVER_H
  #define COVER_H
  
  #include "set.h"
  
  /*****************************************************************************
  *                                                                            *
  *  Define a structure for subsets identified by a key.                       *
  *                                                                            *
  *****************************************************************************/
  
  typedef struct KSet_ {
  
  void               *key;
  Set                set;
  
  } KSet;
  
  /*****************************************************************************
  *                                                                            *
  *  --------------------------- Public Interface ---------------------------  *
  *                                                                            *
  *****************************************************************************/
  
  int cover(Set *members, Set *subsets, Set *covering);
  
  #endif
  