-er a-a a-b a-c a-t aaa aab aac aad aae aan aao aar aat aau ab- aba abb abc abd abe abn abo abr abt abu ac- aca acb acc acd ace acn aco acr act acu ad- ada adb adc add ade adn ado adr adt adu aea aeb aec aed aee aen aeo aer aet aeu an- ana anb anc and ane ann ano anr ant anu aoa aob aoc aod aoe aon aoo aor aot aou ar- ara arb arc ard are arn aro arr art aru at- ata atb atc atd ate atn ato atr att atu au- aua aub auc aud aue aun auo aur aut b-u baa bab bac bad bae ban bao bar bat bau bba bbb bbc bbd bbe bbn bbo bbr bbt bbu bca bcb bcc bcd bce bcn bco bcr bct bcu bda bdb bdc bdd bde bdo bdr bdt bdu be- bea beb bec bed bee ben beo ber bet beu bna bnb bnc bnd bne bnn bno bnr bnt bnu boa bob boc bod boe bon boo bor bot bou bra brb brd bre brn bro brr brt bru bta btb btc btd bte btn bto btr btt btu bua bub buc bud bue bun buo bur but buu c-- caa cab cac cad cae can cao car cat cau cba cbb cbc cbd cbe cbn cbo cbr cbt cbu cca ccb ccc ccd cce ccn cco ccr cct ccu cda cdb cdc cdd cde cdn cdo cdr cdt cdu ce- cea ceb cec ced cee cen ceo cer cet ceu cn- cna cnb cnc cnd cne cnn cno cnr cnt cnu co- coa cob coc cod coe con coo cor cot cou cra crb crc crd cre crn cro crr crt cru cta ctb ctc ctd cte ctn cto ctr ctt ctu cua cub cuc cud cue cun cuo cur cut cuu daa dab dac dad dae dan dao dar dat dau dba dbb dbc dbd dbe dbn dbo dbr dbt dbu dca dcb dcc dcd dce dcn dco dcr dct dcu dda ddb ddc ddd dde ddn ddo ddr ddt ddu de- dea deb dec ded dee den deo der det deu dna dnb dnc dnd dne dnn dno dnr dnt doa dob doc dod doe don doo dor dot dou dra drb drc drd dre drn dro drr drt dru dta dtb dtc dtd dte dtn dto dtr dtt dtu dua dub duc dud due dun duo dur dut eaa eab eac ead eae ean eao ear eat eau eba ebb ebc ebd ebe ebn ebo ebr ebt ebu ec- eca ecb ecc ecd ece ecn eco ecr ect ecu ed- eda edb edc edd ede edn edo edr edt edu eea eeb eec eed eee een eeo eer eet en- ena enb enc end ene enn eno enr ent enu eo- eoa eob eoc eod eoe eon eoo eor eot eou era erb erc erd ere ern ero err ert eru eta etb etc etd ete etn eto etr ett etu eu- eua eub euc eud eue eun eur eut naa nab nac nad nae nan nao nar nat nau nba nbb nbc nbd nbe nbn nbo nbr nbt nbu nca ncb ncc ncd nce ncn nco ncr nct ncu nda ndb ndc ndd nde ndn ndo ndr ndt ndu ne- nea neb nec ned nee nen neo ner net neu nna nnb nnc nne nnn nno nnt nnu no- noa nob noc nod noe non noo nor not nou nra nrb nrc nrd nre nrn nro nrr nrt nru nta ntb ntc ntd nte ntn nto ntr ntt ntu nua nub nuc nud nue nun nuo nur nut nuu oaa oab oac oad oae oan oao oar oat oau ob- oba obb obc obd obe obn obo obr obt obu oc- oca ocb occ ocd ocn oco ocr oct ocu oda odb odc odd ode odn odo odr odt odu oea oeb oec oed oee oen oeo oer oet on- ona onb onc ond one onn ono onr ont onu oo- ooa oob ooc ood oon ooo oor oot or- ora orb orc ord ore orn oro orr ort oru ot- ota otb otc otd ote otn oto otr ott otu ou- oua ouc oud oue oun ouo our out ra- raa rab rac rad rae ran rao rar rat rau rba rbb rbc rbd rbe rbn rbo rbr rbt rbu rca rcb rcc rcd rce rcn rco rcr rct rcu rda rdb rdc rdd rde rdn rdo rdr rdt rdu re- rea reb rec red ree ren reo rer ret reu rna rnb rnc rnd rnn rno rnr rnt rnu roa rob roc rod roe ron roo ror rot rou rra rrb rrc rrd rrn rrr rrt rru rta rtb rtc rtd rte rtn rto rtr rtt rtu rua rub ruc rud rue run ruo rur rut ruu taa tab tac tad tae tan tao tar tat tau tba tbb tbc tbd tbe tbn tbo tbr tbt tbu tca tcb tcc tcd tce tcn tco tcr tct tcu tda tdb tdc tdd tde tdn tdo tdr tdt tdu te- tea teb tec ted tee ten teo ter tet teu tna tnb tnc tnd tne tnn tno tnr tnt to- toa tob toc tod toe ton too tor tot tou tra trb trc trd tre trn tro trr trt tru tta ttb ttc ttd tte ttn tto ttr ttt ttu tua tub tuc tud tue tun tuo tur tut tuu ua- uaa uab uac uad uae uan uao uar uat uau uba ubb ubc ube ubn ubo ubr ubt ubu uca ucb ucc ucd uce ucn uco ucr uct ucu uda udb udc udd ude udn udo udr udt udu uea ueb uec ued uee uen uer uet un- una unb unc und une unn uno unr unt unu uoa uob uoc uod uoe uon uoo uor uot ur- ura urb urc urd ure urn uro urr urt uru uta utb utc utd