text: #pragma once
  
  #include "Node.h"
  
  class Set {
      protected:
          std::string name;
          Set(std::string _name);
          Node* first;
      public:
          bool add(int element);
          bool rmv(int element);
          bool ctn(int element);
          std::string get_name();
          std::string print_set();
  };