i2 : describe X
o2 = Special GushelMukai fourfold of discriminant 12
containing a surface in PP^8 of degree 3 and sectional genus 0
cut out by 7 hypersurfaces of degrees (1,1,1,1,2,2,2)
and with class in G(1,4) given by 2*s_(3,1)+s_(2,2)
Type: ordinary
(case 7 of Table 1 in arXiv:2002.07026)
