-ic bbb bbc bbi bbk bbo bbs bby bcb bcc bci bck bco bcs bcy bi- bib bic bii bik bio bis biy bkb bkc bkk bko bks bob boc boi bok boo bos boy bsb bsc bsi bsk bso bss bsy by- byc byi byk byo bys c-- cbb cbc cbi cbk cbo cbs cby ccb ccc cci cck cco ccs ci- cib cic cii cik cio cis ckb ckc cki cko cks cky co- cob coc coi cok coo cos coy csb csc csi csk cso css csy cyb cyc cyk cyo cys ibb ibc ibi ibk ibo ibs iby icb icc ici ick ico ics icy iib iic iii iio iis ikb ikc iki ikk iko iks io- iob ioc ioi ioo ios is- isb isc isi isk iso iss isy iyc iyo iys iyy kbb kbc kbi kbk kbo kbs kcb kcc kci kck kcs kib kic kii kik kio kis kkb kkc kki kkk kks kky kob koc koi kok koo kos koy ksb ksc ksi ksk kso kss kyc kyo kys o-i ob- obb obc obi obk obo obs oby oc- ocb occ oci ock oco ocs oib oic oii oik oio ois okb okc oki okk oko oks oo- oob ooc ooi ook ooo oos os- osb osc osi osk oso oss oyi oyo oys sbb sbc sbi sbk sbo sbs sby scb scc sci sck sco scs sib sic sii sik sio sis sk- skb skc ski skk sko sks sky sob soc soi sok soo sos soy ss- ssb ssc ssi ssk sso sss sy- syb syc syi syk sys ybc ybi ybs yby ycc yci yco ycs ycy yii yio yis yki ykk yob yoc yoi yok yoo yos yoy ysb ysc ysi ysk yso yss ysy yyb yyc yys yyy