b-u bbb bbg bbi bbk bbr bbu bgb bgg bgi bgk bgr bgu bi- bib big bii bik bir biu bkb bkg bkk bkr brb brg bri brk brr bru bub bug bui buk bur buu gbg gbi gbk gbr gbu ggb ggg ggi ggr ggu gib gig gii gik gir giu gkb grb grg gri grk grr gru gu- gub gug gui guk gur guu ibb ibg ibi ibk ibr ibu igb igg igi igk igr igu iib iii iir iiu ikb iki ikk ikr iku ir- irb irg iri irk irr iru iu- iub iug iui iur kbb kbi kbk kbr kbu kgb kgi kgu kib kig kii kik kir kiu kkb kki kkk kkr kku krg kri krk krr kru kub kug kui kuk kur kuu rbb rbg rbi rbk rbr rbu rgb rgg rgi rgk rgr rib rig rii rik rir rkb rkg rkk rku rrb rrg rri rrk rrr rru rub rug rui ruk rur ruu ubb ubg ubi ubk ubr ubu ugb ugg ugi ugk ugr ugu uib uig uii uir uiu ukb uki ukk ukr uku ur- urb urg uri urk urr uru uug uur uuu