-er a-a a-b a-t aaa aab aae aan aao aar aat aau ab- aba abb abe abn abo abr abt abu aea aeb aee aen aeo aer aet aeu an- ana anb ane ann ano anr ant anu aoa aob aoe aon aoo aor aot aou ar- ara arb are arn aro arr art aru at- ata atb ate atn ato atr att atu au- aua aub aue aun auo aur aut b-u baa bab bae ban bao bar bat bau bba bbb bbe bbn bbo bbr bbt bbu be- bea beb bee ben beo ber bet beu bna bnb bne bnn bno bnr bnt bnu boa bob boe bon boo bor bot bou bra brb bre brn bro brr brt bru bta btb bte btn bto btr btt btu bua bub bue bun buo bur but buu eaa eab eae ean eao ear eat eau eba ebb ebe ebn ebo ebr ebt ebu eea eeb eee een eeo eer eet en- ena enb ene enn eno enr ent enu eo- eoa eob eoe eon eoo eor eot eou era erb ere ern ero err ert eru eta etb ete etn eto etr ett etu eu- eua eub eue eun eur eut naa nab nae nan nao nar nat nau nba nbb nbe nbn nbo nbr nbt nbu ne- nea neb nee nen neo ner net neu nna nnb nne nnn nno nnt nnu no- noa nob noe non noo nor not nou nra nrb nre nrn nro nrr nrt nru nta ntb nte ntn nto ntr ntt ntu nua nub nue nun nuo nur nut nuu oaa oab oae oan oao oar oat oau ob- oba obb obe obn obo obr obt obu oea oeb oee oen oeo oer oet on- ona onb one onn ono onr ont onu oo- ooa oob oon ooo oor oot or- ora orb ore orn oro orr ort oru ot- ota otb ote otn oto otr ott otu ou- oua oue oun ouo our out ra- raa rab rae ran rao rar rat rau rba rbb rbe rbn rbo rbr rbt rbu re- rea reb ree ren reo rer ret reu rna rnb rnn rno rnr rnt rnu roa rob roe ron roo ror rot rou rra rrb rrn rrr rrt rru rta rtb rte rtn rto rtr rtt rtu rua rub rue run ruo rur rut ruu taa tab tae tan tao tar tat tau tba tbb tbe tbn tbo tbr tbt tbu te- tea teb tee ten teo ter tet teu tna tnb tne tnn tno tnr tnt to- toa tob toe ton too tor tot tou tra trb tre trn tro trr trt tru tta ttb tte ttn tto ttr ttt ttu tua tub tue tun tuo tur tut tuu ua- uaa uab uae uan uao uar uat uau uba ubb ube ubn ubo ubr ubt ubu uea ueb uee uen uer uet un- una unb une unn uno unr unt unu uoa uob uoe uon uoo uor uot ur- ura urb ure urn uro urr urt uru uta utb ute utn uto utr utt utu uua uue uun uur uut uuu