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gap> pg := PG(4,5);
ProjectiveSpace(4, 5)
gap> p := Random(Points(pg));
<a point in ProjectiveSpace(4, 5)>
gap> l := Random(Lines(p));
<a line in ProjectiveSpace(4, 5)>
gap> flag := FlagOfIncidenceStructure(pg,[p,l]);
<a flag of ProjectiveSpace(4, 5)>
gap> res := ResidueOfFlag(flag);
Incidence structure of rank 2
gap> gamma := IncidenceGraph(res);;
gap> Diameter(gamma);
3
gap> Girth(gamma);
6
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