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struct Foo {

  union {

    int zero;

    unsigned int one;

  } num1;

  struct X {

      int rock;

      unsigned int rock2;

  };

  union {

    int pebble;

    X x;

    union {

      int qux;

      unsigned int mux;

    };

    unsigned int boulder;

  };

  union {

    int paper;

    unsigned int cloth;

  };

  union {

    int two;

    unsigned int three;

  } num2;

};

union Bar {

  int x;

  unsigned int y;

};

int main()

{

  Foo foo = {0, 0};

  foo.paper = 33;

  foo.pebble = 44;

  foo.mux = 55;

  Bar bar = {0};

  union {

    int z;

    unsigned int w;

  }; w = 0;

  bar.x = 33;

  w = 45;

}