-er a-a a-b a-z aaa aab aae aag aan aar aau aaz ab- aba abb abe abg abn abr abu abz aea aeb aee aeg aen aer aeu aez ag- aga agb age agg agn agr agu agz an- ana anb ane ang ann anr anu anz ar- ara arb are arg arn arr aru arz au- aua aub aue aug aun aur auz az- aza azb aze azg azn azu azz b-u baa bab bae bag ban bar bau baz bba bbb bbe bbg bbn bbr bbu be- bea beb bee beg ben ber beu bez bga bgb bge bgg bgn bgr bgu bgz bna bnb bne bng bnn bnr bnu bnz bra brb bre brg brn brr bru brz bua bub bue bug bun bur buu buz bza bze bzn bzr bzu bzz eaa eab eae eag ean ear eau eaz eba ebb ebe ebg ebn ebr ebu eea eeb eee eeg een eer ega egb ege egg egn egr egu en- ena enb ene eng enn enr enu enz era erb ere erg ern err eru erz eu- eua eub eue eug eun eur eze ezr ezz gaa gab gae gag gan gar gau gaz gba gbe gbg gbn gbr gbu gbz ge- gea geb gee geg gen ger geu gez gga ggb ggg ggn ggr ggu ggz gna gnb gne gnn gnr gnu gra grb gre grg grn grr gru gu- gua gub gue gug gun gur guu guz gza gzr gzu naa nab nae nag nan nar nau naz nba nbb nbe nbg nbn nbr nbu ne- nea neb nee neg nen ner neu nez nga ngb nge ngg ngn ngu nna nnb nne nng nnn nnu nnz nra nrb nre nrg nrn nrr nru nrz nua nub nue nug nun nur nuu nzb nze nzg nzz ra- raa rab rae rag ran rar rau raz rba rbb rbe rbg rbn rbr rbu re- rea reb ree reg ren rer reu rez rga rgb rge rgg rgn rgr rna rnb rng rnn rnr rnu rnz rra rrb rrg rrn rrr rru rua rub rue rug run rur ruu ruz rza rzb rze ua- uaa uab uae uag uan uar uau uaz uba ubb ube ubg ubn ubr ubu uea ueb uee ueg uen uer uga ugb uge ugg ugn ugr ugu un- una unb une ung unn unr unu ur- ura urb ure urg urn urr uru urz uua uue uug uun uur uuu uza uzb uzu z-g zaa zab zag zan zar zaz zbb zbr zea zeb zee zen zer zez zgb zgg zne znn zub zug zun zur zuz zzr zzz