Calling Base Class Methods

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How can method defined in multiple base classes with same name be invoked from derived class simultaneously?

✍: FYIcenter

class x {
   public: m1();
};

class y {
   public: m1();
};

class z: public x, public y {
   public: m1() {
      x::m1();
      y::m1();
   }
};

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