text: #ifndef TIC_TAC_TOE_3
  #define TIC_TAC_TOE_3
  #include "tic_tac_toe.h"
  #include<string>
  #include<vector>
  
  class TicTacToe3 : public TicTacToe
  {
  public:
  	TicTacToe3() : TicTacToe(3) {}
  private:
  	bool check_column_win() override;
  	bool check_row_win() override;
  	bool check_diagonal_win() override;
  
  };
  
  #endif // !TIC_TAC_TOE_3
  