-er b-u bbb bbe bbf bbg bbk bbn bbr bbu be- beb bee bef beg bek ben ber beu bfb bfe bff bfg bfn bfr bfu bgb bge bgf bgg bgk bgn bgr bgu bkb bke bkf bkg bkk bkn bkr bnb bne bnf bng bnk bnn bnr bnu brb bre brf brg brk brn brr bru bub bue buf bug buk bun bur buu ebb ebe ebf ebg ebk ebn ebr ebu eeb eee eef eeg eek een eer ef- efb efe eff efg efr egb ege egf egg egn egr egu ekb eke ekf ekg ekr eku en- enb ene enf eng enk enn enr enu erb ere erf erg erk ern err eru eu- eub eue euf eug eun eur fbb fbe fbf fbg fbk fbn fbr fbu feb fee fef feg fek fen fer feu ffe fff ffg ffk ffn ffr ffu fgb fge fgf fgg fgn fgr fkb fkf fkg fkk fnb fne fnf fng fnk fnn fnr fnu frb fre frf frg frk frn frr fru fub fue fuf fug fuk fun fur fuu gbe gbf gbg gbk gbn gbr gbu ge- geb gee gef geg gek gen ger geu gfb gfe gff gfk gfr ggb ggg ggn ggr ggu gkb gkn gnb gne gnf gnn gnr gnu grb gre grf grg grk grn grr gru gu- gub gue guf gug guk gun gur guu kbb kbe kbf kbk kbn kbr kbu ke- keb kee kef keg kek ken ker kff kfg kfu kgb kgf kgu kkb kke kkk kkn kkr kku kn- kne knf kng knk knn knr knu krf krg krk krn krr kru kub kue kug kuk kun kur kuu nbb nbe nbf nbg nbk nbn nbr nbu ne- neb nee nef neg nek nen ner neu nfb nfe nff nfk nfn nfr nfu ngb nge ngf ngg ngk ngn ngu nke nkf nkk nkn nkr nku nnb nne nnf nng nnk nnn nnu nrb nre nrf nrg nrk nrn nrr nru nub nue nug nuk nun nur nuu rbb rbe rbf rbg rbk rbn rbr rbu re- reb ree ref reg rek ren rer reu rfb rfe rff rfg rfk rfn rfr rfu rgb rge rgf rgg rgk rgn rgr rkb rke rkf rkg rkk rku rnb rng rnn rnr rnu rrb rrf rrg rrk rrn rrr rru rub rue ruf rug ruk run rur ruu ubb ube ubf ubg ubk ubn ubr ubu ueb uee uef ueg uen uer ufe uff ufg ufn ufr ufu ugb uge ugf ugg ugk ugn ugr ugu ukb uke ukf ukk ukn ukr uku un- unb une unf ung unk unn unr unu ur- urb ure urf urg urk urn urr uru uue uug uun uur uuu