-ic b-u bbb bbc bbi bbk bbo bbr bbu bby bcb bcc bci bck bco bcr bcu bcy bi- bib bic bii bik bio bir biu biy bkb bkc bkk bko bkr bob boc boi bok boo bor bou boy brb bri brk bro brr bru bry bub buc bui buk buo bur buu buy by- byc byi byk byo byr byu c-- cbb cbc cbi cbk cbo cbr cbu cby ccb ccc cci cck cco ccr ccu ci- cib cic cii cik cio cir ciu ckb ckc cki cko cky co- cob coc coi cok coo cor cou coy crb crc cri crk cro crr cru cry cub cuc cui cuk cuo cur cuu cuy cyb cyc cyk cyo cyr ibb ibc ibi ibk ibo ibr ibu iby icb icc ici ick ico icr icu icy iib iic iii iio iir iiu ikb ikc iki ikk iko ikr iku io- iob ioc ioi ioo ior iou ir- irb irc iri irk iro irr iru iry iu- iub iuc iui iur iyc iyo iyr iyy kbb kbc kbi kbk kbo kbr kbu kcb kcc kci kck kcr kcu kib kic kii kik kio kir kiu kkb kkc kki kkk kkr kku kky kob koc koi kok koo kor kou koy krc kri krk kro krr kru kry kub kuc kui kuk kur kuu kuy kyc kyo kyr kyu o-i ob- obb obc obi obk obo obr obu oby oc- ocb occ oci ock oco ocr ocu oib oic oii oik oio oir oiu okb okc oki okk oko okr oku oo- oob ooc ooi ook ooo oor or- orb orc ori ork oro orr oru ory ou- ouc oui ouk ouo our oyi oyo rbb rbc rbi rbk rbo rbr rbu rcb rcc rci rco rcr rcu rib ric rii rik rio rir riy rkb rkc rkk rko rku rky rob roc roi rok roo ror rou roy rrb rrc rri rrk rrr rru rub ruc rui ruk ruo rur ruu ruy ry- ryc ryk ryo ryr ryu ryy ubb ubc ubi ubk ubo ubr ubu uby ucb ucc uci uck uco ucr ucu uib uic uii uio uir uiu ukb ukc uki ukk ukr uku uob uoc uok uoo uor ur- urb urc uri urk uro urr uru ury uuc uur uuu uyc uyi uyo uyu ybc ybi ybr yby ycc yci yco ycu ycy yii yio yir yki ykk yob yoc yoi yok yoo yor you yoy yrc yro yru yui yuk yuo yur yuu yuy yyb yyc yyu yyy