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Add Selected

Sums the selected item and all items higher (newer) on the stack

<subroutine ID="AddSelected">

  <ifX wasSelected="false">

    <!-- Remember that if the Y register is empty, neither whileY wasSelected="true" nor whileY wasSelected="false" will loop -->

    <whileY wasSelected="false">

      <MathAdd.Action/>

    </whileY>

    <ifY wasSelected="true">

      <MathAdd.Action/>

    </ifY>

  </ifX>

</subroutine>