i1 : X = specialGushelMukaiFourfold "quintic del Pezzo surface";
o1 : ProjectiveVariety, GM fourfold containing a surface of degree 5 and sectional genus 1
i2 : singularLocus grassmannianHull X
o2 = empty subscheme of PP^8
o2 : ProjectiveVariety, empty subscheme of PP^8
i3 : time X' = < X;
-- used 4.38703 seconds
o3 : ProjectiveVariety, GM fourfold containing a surface of degree 5 and sectional genus 1