text: //h
  #include "tic_tac_toe.h"
  #ifndef TIC_TAC_TOE_4_H
  #define TIC_TAC_TOE_4_H
  
  class TicTacToe4 : public TicTacToe
  {
  public:
  	TicTacToe4() : TicTacToe(4) {};
  	TicTacToe4(std::vector<string> p, string win) : TicTacToe(p, win) {};
  private:
  	bool check_column_win();
  	bool check_row_win();
  	bool check_diagonal_win();
  };
  
  #endif // !TIC_TAC_TOE_4_H