-er a-a a-b a-t aaa aab aae aag aan aao aar aat aau ab- aba abb abe abg abn abo abr abt abu aea aeb aee aeg aen aeo aer aet aeu ag- aga agb age agg agn ago agr agt agu an- ana anb ane ang ann ano anr ant anu aoa aob aoe aog aon aoo aor aot aou ar- ara arb are arg arn aro arr art aru at- ata atb ate atg atn ato atr att atu au- aua aub aue aug aun auo aur aut b-u baa bab bae bag ban bao bar bat bau bba bbb bbe bbg bbn bbo bbr bbt bbu be- bea beb bee beg ben beo ber bet beu bga bgb bge bgg bgn bgo bgr bgt bgu bna bnb bne bng bnn bno bnr bnt bnu boa bob boe bog bon boo bor bot bou bra brb bre brg brn bro brr brt bru bta btb bte btg btn bto btr btt btu bua bub bue bug bun buo bur but buu eaa eab eae eag ean eao ear eat eau eba ebb ebe ebg ebn ebo ebr ebt ebu eea eeb eee eeg een eeo eer eet ega egb ege egg egn ego egr egt egu en- ena enb ene eng enn eno enr ent enu eo- eoa eob eoe eog eon eoo eor eot eou era erb ere erg ern ero err ert eru eta etb ete etg etn eto etr ett etu eu- eua eub eue eug eun eur eut gaa gab gae gag gan gao gar gat gau gba gbe gbg gbn gbo gbr gbt gbu ge- gea geb gee geg gen geo ger get geu gga ggb ggg ggn ggo ggr ggt ggu gna gnb gne gnn gno gnr gnt gnu goa gob goe gog gon goo gor got gou gra grb gre grg grn gro grr grt gru gta gtb gte gtg gtn gto gtr gtt gtu gu- gua gub gue gug gun guo gur gut guu naa nab nae nag nan nao nar nat nau nba nbb nbe nbg nbn nbo nbr nbt nbu ne- nea neb nee neg nen neo ner net neu nga ngb nge ngg ngn ngo ngt ngu nna nnb nne nng nnn nno nnt nnu no- noa nob noe nog non noo nor not nou nra nrb nre nrg nrn nro nrr nrt nru nta ntb nte ntg ntn nto ntr ntt ntu nua nub nue nug nun nuo nur nut nuu oaa oab oae oag oan oao oar oat oau ob- oba obb obe obg obn obo obr obt obu oea oeb oee oeg oen oeo oer oet oga oge ogg ogn ogo ogt on- ona onb one ong onn ono onr ont onu oo- ooa oob oog oon ooo oor oot or- ora orb ore org orn oro orr ort oru ot- ota otb ote otg otn oto otr ott otu ou- oua oue oun ouo our out ra- raa rab rae rag ran rao rar rat rau rba rbb rbe rbg rbn rbo rbr rbt rbu re- rea reb ree reg ren reo rer ret reu rga rgb rge rgg rgn rgo rgr rgt rna rnb rng rnn rno rnr rnt rnu roa rob roe rog ron roo ror rot rou rra rrb rrg rrn rrr rrt rru rta rtb rte rtg rtn rto rtr rtt rtu rua rub rue rug run ruo rur rut ruu taa tab tae tag tan tao tar tat tau tba tbb tbe tbg tbn tbo tbr tbt tbu te- tea teb tee teg ten teo ter tet teu tga tgb tge tgg tgn tgo tgr tgt tgu tna tnb tne tng tnn tno tnr tnt to- toa tob toe tog ton too tor tot tou tra trb tre trg trn tro trr trt tru tta ttb tte ttg ttn tto ttr ttt ttu tua tub tue tug tun tuo tur tut tuu ua- uaa uab uae uag uan uao uar uat uau uba ubb ube ubg ubn ubo ubr ubt ubu uea ueb uee ueg uen uer uet uga ugb uge ugg ugn ugo ugr ugt ugu un- una unb une ung unn uno unr unt unu uoa uob uoe uog uon uoo uor uot ur- ura urb ure urg urn uro urr urt uru uta utb ute utn uto utr utt utu uua uue uug uun uur uut uuu