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<Root>
    <tags>
...
        </Fourth>
     </tags>
<Root>

A
B
C

<Root>
    <tags>
...
        </Third>
      </tags>
</Root>

sample output:
wire  power_control;
wire  add_bus;
wire  cpu_control;

My code

...
     }
    print @ins, "\n";
   }