ideal 0
monomialIdeal(z_(1,1))
monomialIdeal(z_(1,2)*z_(2,1))
monomialIdeal(z_(1,1),z_(1,2)*z_(2,1))
monomialIdeal(z_(1,1),z_(1,2))
monomialIdeal(z_(1,1),z_(2,1))
monomialIdeal(z_(2,1),z_(1,2),z_(1,1))
