i2 : Psi = last graph rationalMap(projectiveVariety ideal(x_4,x_2^2-x_1*x_3,x_1*x_2-x_0*x_3,x_1^2-x_0*x_2),Dominant=>true);
o2 : MultirationalMap (dominant rational map from 4-dimensional subvariety of PP^4 x PP^7 to 4-dimensional subvariety of PP^7)
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