-er a-a a-b a-t aaa aab aae aan aar aat aau ab- aba abb abe abn abr abt abu aea aeb aee aen aer aet aeu an- ana anb ane ann anr ant anu ar- ara arb are arn arr art aru at- ata atb ate atn atr att atu au- aua aub aue aun aur aut b-u baa bab bae ban bar bat bau bba bbb bbe bbn bbr bbt bbu be- bea beb bee ben ber bet beu bna bnb bne bnn bnr bnt bnu bra brb bre brn brr brt bru bta btb bte btn btr btt btu bua bub bue bun bur but buu eaa eab eae ean ear eat eau eba ebb ebe ebn ebr ebt ebu eea eeb eee een eer eet en- ena enb ene enn enr ent enu era erb ere ern err ert eru eta etb ete etn etr ett etu eu- eua eub eue eun eur eut naa nab nae nan nar nat nau nba nbb nbe nbn nbr nbt nbu ne- nea neb nee nen ner net neu nna nnb nne nnn nnt nnu nra nrb nre nrn nrr nrt nru nta ntb nte ntn ntr ntt ntu nua nub nue nun nur nut nuu ra- raa rab rae ran rar rat rau rba rbb rbe rbn rbr rbt rbu re- rea reb ree ren rer ret reu rna rnb rnn rnr rnt rnu rra rrb rrn rrr rrt rru rta rtb rte rtn rtr rtt rtu rua rub rue run rur rut ruu taa tab tae tan tar tat tau tba tbb tbe tbn tbr tbt tbu te- tea teb tee ten ter tet teu tna tnb tne tnn tnr tnt tra trb tre trn trr trt tru tta ttb tte ttn ttr ttt ttu tua tub tue tun tur tut tuu ua- uaa uab uae uan uar uat uau uba ubb ube ubn ubr ubt ubu uea ueb uee uen uer uet un- una unb une unn unr unt unu ur- ura urb ure urn urr urt uru uta utb ute utn utr utt utu uua uue uun uur uut uuu