Timeout in 10.0m

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\[0 \lt c_p \land 0 \lt c_n\]
\[\frac{{\left(\frac{1}{1 + e^{-s}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-s}}\right)}^{c_n}}{{\left(\frac{1}{1 + e^{-t}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-t}}\right)}^{c_n}}\]
\frac{{\left(\frac{1}{1 + e^{-s}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-s}}\right)}^{c_n}}{{\left(\frac{1}{1 + e^{-t}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-t}}\right)}^{c_n}}
double f(double c_p, double c_n, double t, double s) {
        double r51408752 = 1.0;
        double r51408753 = s;
        double r51408754 = -r51408753;
        double r51408755 = exp(r51408754);
        double r51408756 = r51408752 + r51408755;
        double r51408757 = r51408752 / r51408756;
        double r51408758 = c_p;
        double r51408759 = pow(r51408757, r51408758);
        double r51408760 = r51408752 - r51408757;
        double r51408761 = c_n;
        double r51408762 = pow(r51408760, r51408761);
        double r51408763 = r51408759 * r51408762;
        double r51408764 = t;
        double r51408765 = -r51408764;
        double r51408766 = exp(r51408765);
        double r51408767 = r51408752 + r51408766;
        double r51408768 = r51408752 / r51408767;
        double r51408769 = pow(r51408768, r51408758);
        double r51408770 = r51408752 - r51408768;
        double r51408771 = pow(r51408770, r51408761);
        double r51408772 = r51408769 * r51408771;
        double r51408773 = r51408763 / r51408772;
        return r51408773;
}

Reproduce

herbie shell --seed 2019112 +o rules:numerics
(FPCore (c_p c_n t s)
  :name "Harley's example"
  :pre (and (< 0 c_p) (< 0 c_n))

  :herbie-target
  (* (pow (/ (+ 1 (exp (- t))) (+ 1 (exp (- s)))) c_p) (pow (/ (+ 1 (exp t)) (+ 1 (exp s))) c_n))

  (/ (* (pow (/ 1 (+ 1 (exp (- s)))) c_p) (pow (- 1 (/ 1 (+ 1 (exp (- s))))) c_n)) (* (pow (/ 1 (+ 1 (exp (- t)))) c_p) (pow (- 1 (/ 1 (+ 1 (exp (- t))))) c_n))))