CONFIG

tracktype: 1;
mptype:2;

imagthreshold: 1e-4;

securitymaxnorm: 1e8;

sharpendigits:20;

END;

INPUT

variable_group x, y, z, w;

function f1, f2;

f1 = w^2 + x^2 + y^2 + z^2 - 1;
f2 = 2*w*y*z - x*(y^2 + z^2);


END;