Apply df_ifs__df_cgr3__df_fs__df_segle__df_outsideof__df_line2__df_ray__df_lines2__df_fwddif__df_fwddifn__df_hf__df_fne__df_3nand__df_gcdOLD__ax_prv1__ax_prv2__ax_prv3__df_ssb with
∀ x0 x1 : ο . cprvb (x0 ⟶ x1) ⟶ cprvb x0 ⟶ cprvb x1.