-er a-a a-b a-t aaa aab aae aak aan aar aat aau ab- aba abb abe abk abn abr abt abu aea aeb aee aek aen aer aet aeu aka akb ake akk akn akr aku an- ana anb ane ank ann anr ant anu ar- ara arb are ark arn arr art aru at- ata atb ate atn atr att atu au- aua aub aue auk aun aur aut b-u baa bab bae bak ban bar bat bau bba bbb bbe bbk bbn bbr bbt bbu be- bea beb bee bek ben ber bet beu bka bkb bke bkk bkn bkr bkt bna bnb bne bnk bnn bnr bnt bnu bra brb bre brk brn brr brt bru bta btb bte btk btn btr btt btu bua bub bue buk bun bur but buu eaa eab eae eak ean ear eat eau eba ebb ebe ebk ebn ebr ebt ebu eea eeb eee eek een eer eet eka ekb eke ekr ekt eku en- ena enb ene enk enn enr ent enu era erb ere erk ern err ert eru eta etb ete etk etn etr ett etu eu- eua eub eue eun eur eut k-t ka- kaa kab kae kak kan kar kat kau kba kbb kbe kbk kbn kbr kbu ke- kea keb kee kek ken ker ket kkb kke kkk kkn kkr kkt kku kn- kna kne knk knn knr knt knu kra krk krn krr krt kru kta ktb kte ktk ktn ktr ktt ktu kub kue kuk kun kur kut kuu naa nab nae nak nan nar nat nau nba nbb nbe nbk nbn nbr nbt nbu ne- nea neb nee nek nen ner net neu nka nke nkk nkn nkr nkt nku nna nnb nne nnk nnn nnt nnu nra nrb nre nrk nrn nrr nrt nru nta ntb nte ntk ntn ntr ntt ntu nua nub nue nuk nun nur nut nuu ra- raa rab rae rak ran rar rat rau rba rbb rbe rbk rbn rbr rbt rbu re- rea reb ree rek ren rer ret reu rkb rke rkk rkt rku rna rnb rnn rnr rnt rnu rra rrb rrk rrn rrr rrt rru rta rtb rte rtk rtn rtr rtt rtu rua rub rue ruk run rur rut ruu taa tab tae tak tan tar tat tau tba tbb tbe tbk tbn tbr tbt tbu te- tea teb tee tek ten ter tet teu tka tkb tke tkk tkr tkt tna tnb tne tnk tnn tnr tnt tra trb tre trk trn trr trt tru tta ttb tte ttk ttn ttr ttt ttu tua tub tue tuk tun tur tut tuu ua- uaa uab uae uak uan uar uat uau uba ubb ube ubk ubn ubr ubt ubu uea ueb uee uen uer uet uka ukb uke ukk ukn ukr uku un- una unb une unk unn unr unt unu ur- ura urb ure urk urn urr urt uru uta utb ute utk utn utr utt utu uua uue uun uur uut uuu