#ifndef SLIST_H
  #define SLIST_H
  
  #include "tree.h"
  
  typedef
    struct cell{
      node* letter;
      cell* next;}
  //defs
    cell, *List;
  
  
  //function
  List* make_empty_List();
  int is_empty(List);

  int isIn_list(List,char);
  void addAlpha(List*,char);
  void addHead(List*,char);
  void addNext(List*,char);

  
  
  
  #endif //SLIST_H