-er a-a a-b a-t aaa aab aad aae aan aar aat aau ab- aba abb abd abe abn abr abt abu ad- ada adb add ade adn adr adt adu aea aeb aed aee aen aer aet aeu an- ana anb and ane ann anr ant anu ar- ara arb ard are arn arr art aru at- ata atb atd ate atn atr att atu au- aua aub aud aue aun aur aut b-u baa bab bad bae ban bar bat bau bba bbb bbd bbe bbn bbr bbt bbu bda bdb bdd bde bdr bdt bdu be- bea beb bed bee ben ber bet beu bna bnb bnd bne bnn bnr bnt bnu bra brb brd bre brn brr brt bru bta btb btd bte btn btr btt btu bua bub bud bue bun bur but buu daa dab dad dae dan dar dat dau dba dbb dbd dbe dbn dbr dbt dbu dda ddb ddd dde ddn ddr ddt ddu de- dea deb ded dee den der det deu dna dnb dnd dne dnn dnr dnt dra drb drd dre drn drr drt dru dta dtb dtd dte dtn dtr dtt dtu dua dub dud due dun dur dut eaa eab ead eae ean ear eat eau eba ebb ebd ebe ebn ebr ebt ebu ed- eda edb edd ede edn edr edt edu eea eeb eed eee een eer eet en- ena enb end ene enn enr ent enu era erb erd ere ern err ert eru eta etb etd ete etn etr ett etu eu- eua eub eud eue eun eur eut naa nab nad nae nan nar nat nau nba nbb nbd nbe nbn nbr nbt nbu nda ndb ndd nde ndn ndr ndt ndu ne- nea neb ned nee nen ner net neu nna nnb nne nnn nnt nnu nra nrb nrd nre nrn nrr nrt nru nta ntb ntd nte ntn ntr ntt ntu nua nub nud nue nun nur nut nuu ra- raa rab rad rae ran rar rat rau rba rbb rbd rbe rbn rbr rbt rbu rda rdb rdd rde rdn rdr rdt rdu re- rea reb red ree ren rer ret reu rna rnb rnd rnn rnr rnt rnu rra rrb rrd rrn rrr rrt rru rta rtb rtd rte rtn rtr rtt rtu rua rub rud rue run rur rut ruu taa tab tad tae tan tar tat tau tba tbb tbd tbe tbn tbr tbt tbu tda tdb tdd tde tdn tdr tdt tdu te- tea teb ted tee ten ter tet teu tna tnb tnd tne tnn tnr tnt tra trb trd tre trn trr trt tru tta ttb ttd tte ttn ttr ttt ttu tua tub tud tue tun tur tut tuu ua- uaa uab uad uae uan uar uat uau uba ubb ube ubn ubr ubt ubu uda udb udd ude udn udr udt udu uea ueb ued uee uen uer uet un- una unb und une unn unr unt unu ur- ura urb urd ure urn urr urt uru uta utb utd ute utn utr utt utu uua uue uun uur uut uuu