-er a-a a-b aaa aab aae aag aak aan aar aau ab- aba abb abe abg abk abn abr abu aea aeb aee aeg aek aen aer aeu ag- aga agb age agg agk agn agr agu aka akb ake akg akk akn akr aku an- ana anb ane ang ank ann anr anu ar- ara arb are arg ark arn arr aru au- aua aub aue aug auk aun aur b-u baa bab bae bag bak ban bar bau bba bbb bbe bbg bbk bbn bbr bbu be- bea beb bee beg bek ben ber beu bga bgb bge bgg bgk bgn bgr bgu bka bkb bke bkg bkk bkn bkr bna bnb bne bng bnk bnn bnr bnu bra brb bre brg brk brn brr bru bua bub bue bug buk bun bur buu eaa eab eae eag eak ean ear eau eba ebb ebe ebg ebk ebn ebr ebu eea eeb eee eeg eek een eer ega egb ege egg egn egr egu eka ekb eke ekg ekr eku en- ena enb ene eng enk enn enr enu era erb ere erg erk ern err eru eu- eua eub eue eug eun eur gaa gab gae gag gak gan gar gau gba gbe gbg gbk gbn gbr gbu ge- gea geb gee geg gek gen ger geu gga ggb ggg ggn ggr ggu gka gkb gkn gna gnb gne gnn gnr gnu gra grb gre grg grk grn grr gru gu- gua gub gue gug guk gun gur guu ka- kaa kab kae kag kak kan kar kau kba kbb kbe kbk kbn kbr kbu ke- kea keb kee keg kek ken ker kga kgb kgu kkb kke kkk kkn kkr kku kn- kna kne kng knk knn knr knu kra krg krk krn krr kru kub kue kug kuk kun kur kuu naa nab nae nag nak nan nar nau nba nbb nbe nbg nbk nbn nbr nbu ne- nea neb nee neg nek nen ner neu nga ngb nge ngg ngk ngn ngu nka nke nkk nkn nkr nku nna nnb nne nng nnk nnn nnu nra nrb nre nrg nrk nrn nrr nru nua nub nue nug nuk nun nur nuu ra- raa rab rae rag rak ran rar rau rba rbb rbe rbg rbk rbn rbr rbu re- rea reb ree reg rek ren rer reu rga rgb rge rgg rgk rgn rgr rkb rke rkg rkk rku rna rnb rng rnn rnr rnu rra rrb rrg rrk rrn rrr rru rua rub rue rug ruk run rur ruu ua- uaa uab uae uag uak uan uar uau uba ubb ube ubg ubk ubn ubr ubu uea ueb uee ueg uen uer uga ugb uge ugg ugk ugn ugr ugu uka ukb uke ukk ukn ukr uku un- una unb une ung unk unn unr unu ur- ura urb ure urg urk urn urr uru uua uue uug uun uur uuu