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gap> ps := ProjectiveSpace(3,3);
ProjectiveSpace(3, 3)
gap> l := ElementsOfIncidenceStructure(ps,2);
<lines of ProjectiveSpace(3, 3)>
gap> ps := EllipticQuadric(5,9);
Q-(5, 9)
gap> lines := ElementsOfIncidenceStructure(ps,2);
<lines of Q-(5, 9)>
gap> planes := ElementsOfIncidenceStructure(ps,3);
Error, <geo> has no elements of type <j> called from
<function "unknown">( <arguments> )
called from read-eval loop at line 12 of *stdin*
you can 'quit;' to quit to outer loop, or
you can 'return;' to continue
brk> quit;
gap> as := AffineSpace(3,9);
AG(3, 9)
gap> lines := ElementsOfIncidenceStructure(as,"lines");
<lines of AG(3, 9)>
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