x_1, x_2, 
x_1^3*x_2^2-x_2^5+x_1^4-2*x_1*x_2^3-x_2^3-6
2*x_2^5-2*x_1^3*x_2+5*x_2^4+3*x_2^3-3*x_1^2-4*x_1*x_2+36
