-er b-u bbb bbe bbg bbn bbr bbu be- beb bee beg ben ber beu bgb bge bgg bgn bgr bgu bnb bne bng bnn bnr bnu brb bre brg brn brr bru bub bue bug bun bur buu ebb ebe ebg ebn ebr ebu eeb eee eeg een eer egb ege egg egn egr egu en- enb ene eng enn enr enu erb ere erg ern err eru eu- eub eue eug eun eur gbe gbg gbn gbr gbu ge- geb gee geg gen ger geu ggb ggg ggn ggr ggu gnb gne gnn gnr gnu grb gre grg grn grr gru gu- gub gue gug gun gur guu nbb nbe nbg nbn nbr nbu ne- neb nee neg nen ner neu ngb nge ngg ngn ngu nnb nne nng nnn nnu nrb nre nrg nrn nrr nru nub nue nug nun nur nuu rbb rbe rbg rbn rbr rbu re- reb ree reg ren rer reu rgb rge rgg rgn rgr rnb rng rnn rnr rnu rrb rrg rrn rrr rru rub rue rug run rur ruu ubb ube ubg ubn ubr ubu ueb uee ueg uen uer ugb uge ugg ugn ugr ugu un- unb une ung unn unr unu ur- urb ure urg urn urr uru uue uug uun uur uuu