-ic bbb bbc bbi bbn bbo bcb bcc bci bcn bco bi- bib bic bii bin bio bnb bnc bni bnn bno bob boc boi bon boo c-- cbb cbc cbi cbn cbo ccb ccc cci ccn cco ci- cib cic cii cin cio cn- cnb cnc cni cnn cno co- cob coc coi con coo ibb ibc ibi ibn ibo icb icc ici icn ico iib iic iii iin iio in- inb inc ini inn ino io- iob ioc ioi ion ioo n-i nbb nbc nbi nbn nbo ncb ncc nci ncn nco nib nic nii nin nio nnb nnc nni nnn nno no- nob noc noi non noo o-i ob- obb obc obi obn obo oc- ocb occ oci ocn oco oib oic oii oin oio on- onb onc oni onn ono oo- oob ooc ooi oon ooo