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struct interface1 {
  virtual ~I1();
  virtual void f11() = 0;
  virtual void f12() = 0;
  // ...
};
struct interface2 {
  virtual ~I2();
  virtual void f21() = 0;
  virtual void f22() = 0;
  // ...
};
/* interface more */
class base { /**/ };
class derived : public base, public interface1,public interface2 /* interface more */
{
   void f11() { /* implement */ }
   void f21() { /* implement */ }
   /* more implement */
};
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