xpath help?

How do I get all possible sizes from the following XML
using only one xPath given the criteria of
ot[(_at_)id = 2 or @id  = 3] and ct[(_at_)id = 1]?

so, I'd want size id's = (2,4)??

thanks in advance.


<hls>
  <hl>
    <ots>
       <ot id="2"/>
       <ot id="3"/>
    </ots>
    <cts>
       <ct id="1"/>
       <ct id="5"/>
    </cts>
    <sizes>
       <size id="2"/>
       <size id="4"/>
    </sizes>
  </hl>
  <hl>
    <ots>
       <ot id="2"/>
       <ot id="4"/>
    </ots>
    <cts>
       <ct id="2"/>
       <ct id="5"/>
    </cts>
    <sizes>
       <size id="3"/>
       <size id="8"/>
    </sizes>
  </hl>
</hls>

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