docs: public final void removeElementsAt(int firstindex, int count)
    {
      if (tc.isEntryEnabled())
        SibTr.entry(
          tc,
          "removeElementsAt",
          new Object[] { new Integer(firstindex), new Integer(count)});
  
      removeRange(firstindex, firstindex + count);
  
      if (tc.isEntryEnabled())
        SibTr.exit(tc, "removeElementsAt");
    }