b-u bbb bbi bbk bbo bbr bbt bbu bi- bib bii bik bio bir bit biu biv bkb bkk bko bkr bkt bkv bob boi bok boo bor bot bou bov brb bri brk bro brr brt bru brv btb bti btk bto btr btt btu btv bub bui buk buo bur but buu bvb bvi bvk bvo bvr bvt bvu bvv i-v ibb ibi ibk ibo ibr ibt ibu ibv iib iii iio iir iit iiu ikb iki ikk iko ikr ikt iku ikv io- iob ioi ioo ior iot iou iov ir- irb iri irk iro irr irt iru irv itb iti itk ito itt itu itv iu- iub iui iur iut ivb ivi ivo ivr ivt ivu ivv k-t kbb kbi kbk kbo kbr kbu kib kii kik kio kir kit kiu kiv kkb kki kkk kkr kkt kku kkv kob koi kok koo kor kot kou kri krk kro krr krt kru krv ktb ktk kto ktr ktt ktu ktv kub kui kuk kur kut kuu kvb kvi kvk kvo kvr kvv o-i ob- obb obi obk obo obr obt obu obv oib oii oik oio oir oit oiu oiv okb oki okk oko okr oku oo- oob ooi ook ooo oor oot oov or- orb ori ork oro orr ort oru orv ot- otb oti otk oto otr ott otu otv ou- oui ouk ouo our out ov- ovb ovi ovo ovv rbb rbi rbk rbo rbr rbt rbu rib rii rik rio rir rit riv rkb rkk rko rkt rku rkv rob roi rok roo ror rot rou rov rrb rri rrk rrr rrt rru rtb rti rtk rto rtr rtt rtu rtv rub rui ruk ruo rur rut ruu ruv rvb rvi rvo rvr rvt rvu rvv tbb tbi tbk tbo tbr tbt tbu tbv tib tii tik tio tir tit tiu tiv tkb tkk tko tkr tkt to- tob toi tok too tor tot tou tov trb tri trk tro trr trt tru trv ttb tti ttk tto ttr ttt ttu ttv tub tui tuk tuo tur tut tuu tuv tvb tvi tvk tvo tvr tvt tvu ubb ubi ubk ubo ubr ubt ubu ubv uib uii uio uir uit uiu ukb uki ukk ukr uku uob uok uoo uor uot ur- urb uri urk uro urr urt uru utb uti utk uto utr utt utu utv uur uut uuu uvb uvo uvu uvv vbi vbk vbo vbr vbv vi- vib vii vik vio vir vit viu viv vkb vkt vob voi vok voo vor vot vou vov vrb vri vrk vrr vrt vru vtb vti vtk vto vtr vtt vtu vtv vuk vur vut vuv vvb vvi vvo vvr vvt vvv