gap> ps := SymplecticSpace(5,7);
W(5, 7)
gap> p := Random(Points(ps));
<a point in W(5, 7)>
gap> plane := Random(Planes(p));
<a plane in W(5, 7)>
gap> flag := FlagOfIncidenceStructure(ps,[p,p,plane]);
<a flag of W(5, 7) >
gap> Size(flag);
2
gap> ElementsOfFlag(flag);
[ <a point in W(5, 7)>, <a plane in W(5, 7)> ]
