      19               

                                           

      1        10           

       10            ABCD               A   O                    A      p  Q         A           APOQ            APOQ         10     A        APOQ         10       

 19-10 x 19-10 =92

      

   18        19-18 x 19-18 =12

   17        19-17 x 19-17 =22

  16        19-16 x 19-16 =32

 

  2        19-2 x 19-2 =172

   1        19-1 x 19-1 =182

       10                    APOQ           10                   10                                