Cannot sample enough valid points. (more)

\[\frac{\frac{\frac{{a}^{b}}{{c}^{d}}}{{a}^{c}}}{{b}^{d}}\]
\frac{\frac{\frac{{a}^{b}}{{c}^{d}}}{{a}^{c}}}{{b}^{d}}
double code(double a, double b, double c, double d) {
	return ((double) (((double) (((double) (((double) pow(a, b)) / ((double) pow(c, d)))) / ((double) pow(a, c)))) / ((double) pow(b, d))));
}

Reproduce

herbie shell --seed 2020152 
(FPCore (a b c d)
  :name "(/ (/ (/ (pow a b) (pow c d)) (pow a c)) (pow b d))"
  :precision binary64
  (/ (/ (/ (pow a b) (pow c d)) (pow a c)) (pow b d)))