bbb bbi bbk bbo bbr bbs bby bi- bib bii bik bio bir bis biv biy bkb bkk bko bkr bks bkv bob boi bok boo bor bos bov boy brb bri brk bro brr brs brv bry bsb bsi bsk bso bsr bss bsv bsy bvb bvi bvk bvo bvr bvs bvv by- byi byk byo byr bys i-v ibb ibi ibk ibo ibr ibs ibv iby iib iii iio iir iis ikb iki ikk iko ikr iks ikv io- iob ioi ioo ior ios iov ir- irb iri irk iro irr irs irv iry is- isb isi isk iso isr iss isv isy ivb ivi ivo ivr ivs ivv ivy iyo iyr iys iyy kbb kbi kbk kbo kbr kbs kib kii kik kio kir kis kiv kkb kki kkk kkr kks kkv kky kob koi kok koo kor kos koy kri krk kro krr krs krv kry ksb ksi ksk kso ksr kss ksv kvb kvi kvk kvo kvr kvs kvv kyo kyr kys o-i ob- obb obi obk obo obr obs obv oby oib oii oik oio oir ois oiv okb oki okk oko okr oks oo- oob ooi ook ooo oor oos oov or- orb ori ork oro orr ors orv ory os- osb osi osk oso osr oss osv ov- ovb ovi ovo ovs ovv oyi oyo oys rbb rbi rbk rbo rbr rbs rib rii rik rio rir ris riv riy rkb rkk rko rks rkv rky rob roi rok roo ror ros rov roy rrb rri rrk rrr rrs rsb rsi rsk rso rsr rss rsv rvb rvi rvo rvr rvs rvv rvy ry- ryk ryo ryr rys ryy sbb sbi sbk sbo sbr sbs sbv sby sib sii sik sio sir sis siv sk- skb ski skk sko skr sks sky sob soi sok soo sor sos sov soy sr- srb sri srk sro srr srs srv sry ss- ssb ssi ssk sso ssr sss ssv svb svi svk svo svr svs svv svy sy- syb syi syk syr sys vbi vbk vbo vbr vbs vbv vi- vib vii vik vio vir vis viv viy vkb vob voi vok voo vor vos vov voy vrb vri vrk vrr vrs vry vsb vsi vsk vso vsr vss vsv vvb vvi vvo vvr vvs vvv ybi ybr ybs yby yii yio yir yis yki ykk yob yoi yok yoo yor yos yoy yro yrs ysb ysi ysk yso ysr yss ysy yvi yvo yvr yvy yyb yys yyy