code: def parametric_log_deriv(fa, fd, wa, wd, DE):
      # TODO: Write the full algorithm using the structure theorems.
      #    try:
      A = parametric_log_deriv_heu(fa, fd, wa, wd, DE)
      #    except NotImplementedError:
      # Heuristic failed, we have to use the full method.
      # TODO: This could be implemented more efficiently.
      # It isn't too worrisome, because the heuristic handles most difficult
      # cases.
      return A
  
imports: import itertools
  from functools import reduce
  from sympy.core.intfunc import ilcm
  from sympy.core import Dummy, Add, Mul, Pow, S
  from sympy.integrals.rde import order_at, order_at_oo, weak_normalizer, bound_degree
  from sympy.integrals.risch import gcdex_diophantine, frac_in, derivation, residue_reduce, splitfactor, residue_reduce_derivation, DecrementLevel, recognize_log_derivative
  from sympy.polys import Poly, lcm, cancel, sqf_list
  from sympy.polys.polymatrix import PolyMatrix
  from sympy.solvers import solve
label_desc: Use image node_id 16 for calling a global function with example usage: parametric_log_deriv(fa, fd, wa, wd, DE) and returns: A