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  1.     
  2.     _I_s _a_n _O_b_j_e_c_t _o_f _T_y_p_e _F_u_n_c_t_i_o_n?
  3.     
  4.          is.function(x)
  5.     
  6.     _D_e_s_c_r_i_p_t_i_o_n:
  7.     
  8.          is.function returns TRUE if x is a function and FALSE
  9.          otherwise.
  10.     
  11.