b-u bbb bbi bbk bbn bbo bbr bbu bi- bib bii bik bin bio bir biu biv bkb bkk bkn bko bkr bkv bnb bni bnk bnn bno bnr bnu bnv bob boi bok bon boo bor bou bov brb bri brk brn bro brr bru brv bub bui buk bun buo bur buu bvb bvi bvk bvn bvo bvr bvu bvv i-v ibb ibi ibk ibn ibo ibr ibu ibv iib iii iin iio iir iiu ikb iki ikk iko ikr iku ikv in- inb ini ink inn ino inr inu inv io- iob ioi ion ioo ior iou iov ir- irb iri irk irn iro irr iru irv iu- iub iui iur ivb ivi ivo ivr ivu ivv kbb kbi kbk kbn kbo kbr kbu kib kii kik kin kio kir kiu kiv kkb kki kkk kkn kkr kku kkv kn- kni knk knn kno knr knu kob koi kok kon koo kor kou kri krk krn kro krr kru krv kub kui kuk kun kur kuu kvb kvi kvk kvn kvo kvr kvv n-i nbb nbi nbk nbn nbo nbr nbu nbv nib nii nik nin nio nir niu niv nki nkk nkn nko nkr nku nnb nni nnk nnn nno nnu nnv no- nob noi nok non noo nor nou nov nrb nri nrk nrn nro nrr nru nrv nub nui nuk nun nuo nur nuu nuv nvb nvi nvk nvn nvu nvv o-i ob- obb obi obk obn obo obr obu obv oib oii oik oin oio oir oiu oiv okb oki okk oko okr oku on- onb oni onk onn ono onr onu oo- oob ooi ook oon ooo oor oov or- orb ori ork orn oro orr oru orv ou- oui ouk oun ouo our ov- ovb ovi ovo ovv rbb rbi rbk rbn rbo rbr rbu rib rii rik rin rio rir riv rkb rkk rko rku rkv rnb rni rnn rno rnr rnu rnv rob roi rok ron roo ror rou rov rrb rri rrk rrn rrr rru rub rui ruk run ruo rur ruu ruv rvb rvi rvn rvo rvr rvu rvv ubb ubi ubk ubn ubo ubr ubu ubv uib uii uin uio uir uiu ukb uki ukk ukn ukr uku un- unb uni unk unn uno unr unu unv uob uok uon uoo uor ur- urb uri urk urn uro urr uru uun uur uuu uvb uvo uvu uvv vbi vbk vbo vbr vbv vi- vib vii vik vin vio vir viu viv vkb vn- vni vno vnr vnu vnv vob voi vok von voo vor vou vov vrb vri vrk vrn vrr vru vuk vur vuv vvb vvi vvo vvr vvv