gap&gt; pg := PG(5,7);
ProjectiveSpace(5, 7)
gap&gt; planes := Planes(pg);
&lt;planes of ProjectiveSpace(5, 7)&gt;
gap&gt; iter := Iterator(planes);
&lt;iterator&gt;
gap&gt; NextIterator(iter);
&lt;a plane in ProjectiveSpace(5, 7)&gt;
gap&gt; NextIterator(iter);
&lt;a plane in ProjectiveSpace(5, 7)&gt;
gap&gt; NextIterator(iter);
&lt;a plane in ProjectiveSpace(5, 7)&gt;
