i1 : P5 = QQ[t_0..t_5]; phi = rationalMap(P5/(35*t_1+45*t_2+21*t_3+525*t_4+1365*t_5,1575*t_0*t_23250*t_2^2+735*t_0*t_31890*t_2*t_31666*t_3^2+17150*t_0*t_447250*t_2*t_422050*t_3*t_4276850*t_4^2+46550*t_0*t_5122850*t_2*t_557330*t_3*t_51433250*t_4*t_51864450*t_5^2),P5/(315*t_0+280*t_1+45*t_2+21*t_3+210*t_4+1050*t_5),{45*t_221*t_3490*t_41330*t_5, 45*t_2+21*t_3+525*t_4+1365*t_5, 35*t_2, 35*t_3, 35*t_4, 35*t_5});
o2 : RationalMap (linear rational map from threefold in PP^5 to hypersurface in PP^5)
