-er a-a a-b a-c a-t aaa aab aac aad aae aao aar aas aat aau ab- aba abb abc abd abe abo abr abs abt abu ac- aca acb acc acd ace aco acr acs act acu ad- ada adb adc add ade ado adr ads adt adu aea aeb aec aed aee aeo aer aes aet aeu aoa aob aoc aod aoe aoo aor aos aot aou ar- ara arb arc ard are aro arr ars art aru as- asa asb asc asd ase aso asr ass ast asu at- ata atb atc atd ate ato atr ats att atu au- aua aub auc aud aue auo aur aus aut b-u baa bab bac bad bae bao bar bas bat bau bba bbb bbc bbd bbe bbo bbr bbs bbt bbu bca bcb bcc bcd bce bco bcr bcs bct bcu bda bdb bdc bdd bde bdo bdr bds bdt bdu be- bea beb bec bed bee beo ber bes bet beu boa bob boc bod boe boo bor bos bot bou bra brb brd bre bro brr brs brt bru bsa bsb bsc bsd bse bso bsr bss bst bsu bta btb btc btd bte bto btr bts btt btu bua bub buc bud bue buo bur bus but buu c-- caa cab cac cad cae cao car cas cat cau cba cbb cbc cbd cbe cbo cbr cbs cbt cbu cca ccb ccc ccd cce cco ccr ccs cct ccu cda cdb cdc cdd cde cdo cdr cds cdt cdu ce- cea ceb cec ced cee ceo cer ces cet ceu co- coa cob coc cod coe coo cor cos cot cou cra crb crc crd cre cro crr crs crt cru csa csb csc csd cse cso csr css cst csu cta ctb ctc ctd cte cto ctr cts ctt ctu cua cub cuc cud cue cuo cur cus cut cuu daa dab dac dad dae dao dar das dat dau dba dbb dbc dbd dbe dbo dbr dbs dbt dbu dca dcb dcc dcd dce dco dcr dcs dct dcu dda ddb ddc ddd dde ddo ddr dds ddt ddu de- dea deb dec ded dee deo der des det deu doa dob doc dod doe doo dor dos dot dou dra drb drc drd dre dro drr drs drt dru dsa dsb dsc dsd dse dso dsr dss dst dsu dta dtb dtc dtd dte dto dtr dts dtt dtu dua dub duc dud due duo dur dus dut eaa eab eac ead eae eao ear eas eat eau eba ebb ebc ebd ebe ebo ebr ebs ebt ebu ec- eca ecb ecc ecd ece eco ecr ecs ect ecu ed- eda edb edc edd ede edo edr eds edt edu eea eeb eec eed eee eeo eer ees eet eo- eoa eob eoc eod eoe eoo eor eos eot eou era erb erc erd ere ero err ers ert eru es- esa esb esc esd ese eso esr ess est esu eta etb etc etd ete eto etr ets ett etu eu- eua eub euc eud eue eur eus eut oaa oab oac oad oae oao oar oas oat oau ob- oba obb obc obd obe obo obr obs obt obu oc- oca ocb occ ocd oco ocr ocs oct ocu oda odb odc odd ode odo odr ods odt odu oea oeb oec oed oee oeo oer oes oet oo- ooa oob ooc ood ooo oor oos oot or- ora orb orc ord ore oro orr ors ort oru os- osa osb osc osd ose oso osr oss ost osu ot- ota otb otc otd ote oto otr ots ott otu ou- oua ouc oud oue ouo our ous out ra- raa rab rac rad rae rao rar ras rat rau rba rbb rbc rbd rbe rbo rbr rbs rbt rbu rca rcb rcc rcd rce rco rcr rcs rct rcu rda rdb rdc rdd rde rdo rdr rds rdt rdu re- rea reb rec red ree reo rer res ret reu roa rob roc rod roe roo ror ros rot rou rra rrb rrc rrd rrr rrs rrt rru rsa rsb rsc rsd rse rso rsr rss rst rsu rta rtb rtc rtd rte rto rtr rts rtt rtu rua rub ruc rud rue ruo rur rus rut ruu saa sab sac sad sae sao sar sas sat sau sba sbb sbc sbd sbe sbo sbr sbs sbt sbu sca scb scc scd sce sco scr scs sct scu sda sdb sdc sdd sde sdo sdr sds sdt sdu se- sea seb sec sed see seo ser ses set seu soa sob soc sod soe soo sor sos sot sou sr- sra srb src srd sre sro srr srs srt ss- ssa ssb ssc ssd sse sso ssr sss sst ssu sta stb stc std ste sto str sts stt stu sua sub suc sud sue suo sur sus sut suu taa tab tac tad tae tao tar tas tat tau tba tbb tbc tbd tbe tbo tbr tbs tbt tbu tca tcb tcc tcd tce tco tcr tcs tct tcu tda tdb tdc tdd tde tdo tdr tds tdt tdu te- tea teb tec ted tee teo ter tes tet teu to- toa tob toc tod toe too tor tos tot tou tra trb trc trd tre tro trr trs trt tru tsa tsb tsc tsd tse tso tsr tss tst tsu tta ttb ttc ttd tte tto ttr tts ttt ttu tua tub tuc tud tue tuo tur tus tut tuu ua- uaa uab uac uad uae uao uar uas uat uau uba ubb ubc ube ubo ubr ubs ubt ubu uca ucb ucc ucd uce uco ucr ucs uct ucu uda udb udc udd ude udo udr uds udt udu uea ueb uec ued uee uer ues uet uoa uob uoc uod uoe uoo uor uos uot ur- ura urb urc urd ure uro urr urs urt uru usa usb usc usd use uso usr uss ust usu