-er b-u bbb bbe bbg bbk bbn bbr bbu be- beb bee beg bek ben ber beu bgb bge bgg bgk bgn bgr bgu bkb bke bkg bkk bkn bkr bnb bne bng bnk bnn bnr bnu brb bre brg brk brn brr bru bub bue bug buk bun bur buu ebb ebe ebg ebk ebn ebr ebu eeb eee eeg eek een eer egb ege egg egn egr egu ekb eke ekg ekr eku en- enb ene eng enk enn enr enu erb ere erg erk ern err eru eu- eub eue eug eun eur gbe gbg gbk gbn gbr gbu ge- geb gee geg gek gen ger geu ggb ggg ggn ggr ggu gkb gkn gnb gne gnn gnr gnu grb gre grg grk grn grr gru gu- gub gue gug guk gun gur guu kbb kbe kbk kbn kbr kbu ke- keb kee keg kek ken ker kgb kgu kkb kke kkk kkn kkr kku kn- kne kng knk knn knr knu krg krk krn krr kru kub kue kug kuk kun kur kuu nbb nbe nbg nbk nbn nbr nbu ne- neb nee neg nek nen ner neu ngb nge ngg ngk ngn ngu nke nkk nkn nkr nku nnb nne nng nnk nnn nnu nrb nre nrg nrk nrn nrr nru nub nue nug nuk nun nur nuu rbb rbe rbg rbk rbn rbr rbu re- reb ree reg rek ren rer reu rgb rge rgg rgk rgn rgr rkb rke rkg rkk rku rnb rng rnn rnr rnu rrb rrg rrk rrn rrr rru rub rue rug ruk run rur ruu ubb ube ubg ubk ubn ubr ubu ueb uee ueg uen uer ugb uge ugg ugk ugn ugr ugu ukb uke ukk ukn ukr uku un- unb une ung unk unn unr unu ur- urb ure urg urk urn urr uru uue uug uun uur uuu