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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
Project: cocalc-sagemath-dev-slelievre
Views: 418346Prank:=function(G)
local S, p;
p:=SSortedList(Factors(Order(G)));
if not Length(p)=1 then
Print("G must be a finite p-group. \n");
return fail;
fi;
p:=p[1];
S:=LatticeSubgroups(G);
S:=ConjugacyClassesSubgroups(S);
S:=List(S,x->ClassElementLattice(x,1));
S:=Filtered(S,x->IsElementaryAbelian(x));
S:=List(S,x->Order(x));
return Log(Maximum(S),p);
end;