PWS-5
... that only five units of the production model PWS-5, a Polish liaison aircraft, were built?
... that only five units of the production model <b id="mwG6g"><a href="./PWS-5" id="mwG6k" rel="mw:WikiLink" title="PWS-5">PWS-5</a></b>, a Polish <a href="./Liaison_aircraft" id="mwG6o" rel="mw:WikiLink" title="Liaison aircraft">liaison aircraft</a>, were built?