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  1.     
  2.     _I_s _a_n _O_b_j_e_c_t _R_e_c_u_r_s_i_v_e?
  3.     
  4.          is.recursive(x)
  5.     
  6.     _D_e_s_c_r_i_p_t_i_o_n:
  7.     
  8.          is.recursive returns TRUE if x has a recursive (list-
  9.          like) structure and FALSE otherwise.
  10.     
  11.