-ic bbb bbc bbi bbk bbo bcb bcc bci bck bco bcz bi- bib bic bii bik bio biz bkb bkc bkk bko bob boc boi bok boo boz bzo bzz c-- cbb cbc cbi cbk cbo cbz ccb ccc cci cck cco ccz ci- cib cic cii cik cio ckb ckc cki cko co- cob coc coi cok coo coz cz- czc czk czo ibb ibc ibi ibk ibo ibz icb icc ici ick ico icz iib iic iii iio ikb ikc iki ikk iko io- iob ioc ioi ioo izi izo izz k-z kbb kbc kbi kbk kbo kbz kcb kcc kci kck kib kic kii kik kio kiz kkb kkc kki kkk kob koc koi kok koo koz kzo o-i ob- obb obc obi obk obo oc- ocb occ oci ock oco ocz oib oic oii oik oio oiz okb okc oki okk oko oo- oob ooc ooi ook ooo ozo ozz zbb zbc zco zib zik zio ziz zo- zob zoc zoi zok zoo zzz