CONFIG

TRACKTYPE: 1;

END;

INPUT

variable_group x, y, z;
function f1, f2, f3;

f1 = (x^2 + y^2 + z^2 - 1)*(x-1/2);
f2 = (x^2 + y^2 + z^2 - 1)*(y-1/2);
f3 = (x^2 + y^2 + z^2 - 1)*(z-1/2);

END;

