mySTree after inserting 
                            16

             10                            20

       5            15              17            25

                 12                    17      22    28

                   14

                 12

myOTree after calling copy constructor 
                            16

             10                            20

       5            15              17            25

                 12                    17      22    28

                   14

                 12

myPTree after using = operator 
                            16

             10                            20

       5            15              17            25

                 12                    17      22    28

                   14

                 12