-ic bbb bbc bbi bbn bbo bcb bcc bci bcn bco bcz bi- bib bic bii bin bio biz bnb bnc bni bnn bno bnz bob boc boi bon boo boz bzn bzo bzz c-- cbb cbc cbi cbn cbo cbz ccb ccc cci ccn cco ccz ci- cib cic cii cin cio cn- cnb cnc cni cnn cno co- cob coc coi con coo coz cz- czc czo ibb ibc ibi ibn ibo ibz icb icc ici icn ico icz iib iic iii iin iio in- inb inc ini inn ino io- iob ioc ioi ion ioo izi izo izz n-i nbb nbc nbi nbn nbo ncb ncc nci ncn nco nib nic nii nin nio niz nnb nnc nni nnn nno nnz no- nob noc noi non noo noz nzb nzi nzo nzz o-i ob- obb obc obi obn obo oc- ocb occ oci ocn oco ocz oib oic oii oin oio oiz on- onb onc oni onn ono oo- oob ooc ooi oon ooo ozo ozz zbb zbc zco zib zin zio ziz znc znn zno zo- zob zoc zoi zon zoo zzz