code: def dup_compose(f, g, K):
      """
      Evaluate functional composition ``f(g)`` in ``K[x]``.
  
      Examples
      ========
  
      >>> from sympy.polys import ring, ZZ
      >>> R, x = ring("x", ZZ)
  
      >>> R.dup_compose(x**2 + x, x - 1)
      x**2 - x
  
      """
      if len(g) <= 1:
          return dup_strip([dup_eval(f, dup_LC(g, K), K)])
  
      if not f:
          return []
  
      h = [f[0]]
  
      for c in f[1:]:
          h = dup_mul(h, g, K)
          h = dup_add_term(h, c, 0, K)
  
      return h
  
imports: from sympy.polys.densearith import dup_add_term, dmp_add_term, dup_lshift, dup_add, dmp_add, dup_sub, dmp_sub, dup_mul, dmp_mul, dup_sqr, dup_div, dup_rem, dmp_rem, dmp_expand, dup_mul_ground, dmp_mul_ground, dup_quo_ground, dmp_quo_ground, dup_exquo_ground, dmp_exquo_ground
  from sympy.polys.densebasic import dup_strip, dmp_strip, dup_convert, dmp_convert, dup_degree, dmp_degree, dmp_to_dict, dmp_from_dict, dup_LC, dmp_LC, dmp_ground_LC, dup_TC, dmp_TC, dmp_zero, dmp_ground, dmp_zero_p, dup_to_raw_dict, dup_from_raw_dict, dmp_zeros
  from sympy.polys.polyerrors import MultivariatePolynomialError, DomainError
  from sympy.utilities import variations
  from math import ceil, log
label_desc: Use image node_id 33 for calling a global function with example usage: dup_compose(f, g, K) and returns: h, dup_strip, list