-er a-a a-b a-c a-t aaa aab aac aae aag aao aar aas aat aau ab- aba abb abc abe abg abo abr abs abt abu ac- aca acb acc ace acg aco acr acs act acu aea aeb aec aee aeg aeo aer aes aet aeu ag- aga agb agc age agg ago agr ags agt agu aoa aob aoc aoe aog aoo aor aos aot aou ar- ara arb arc are arg aro arr ars art aru as- asa asb asc ase asg aso asr ass ast asu at- ata atb atc ate atg ato atr ats att atu au- aua aub auc aue aug auo aur aus aut b-u baa bab bac bae bag bao bar bas bat bau bba bbb bbc bbe bbg bbo bbr bbs bbt bbu bca bcb bcc bce bcg bco bcr bcs bct bcu be- bea beb bec bee beg beo ber bes bet beu bga bgb bgc bge bgg bgo bgr bgs bgt bgu boa bob boc boe bog boo bor bos bot bou bra brb bre brg bro brr brs brt bru bsa bsb bsc bse bsg bso bsr bss bst bsu bta btb btc bte btg bto btr bts btt btu bua bub buc bue bug buo bur bus but buu c-- caa cab cac cae cag cao car cas cat cau cba cbb cbc cbe cbg cbo cbr cbs cbt cbu cca ccb ccc cce ccg cco ccr ccs cct ccu ce- cea ceb cec cee ceg ceo cer ces cet ceu cga cgb cgc cge cgg cgo cgr cgs cgt cgu co- coa cob coc coe cog coo cor cos cot cou cra crb crc cre crg cro crr crs crt cru csa csb csc cse csg cso csr css cst csu cta ctb ctc cte ctg cto ctr cts ctt ctu cua cub cuc cue cug cuo cur cus cut cuu eaa eab eac eae eag eao ear eas eat eau eba ebb ebc ebe ebg ebo ebr ebs ebt ebu ec- eca ecb ecc ece ecg eco ecr ecs ect ecu eea eeb eec eee eeg eeo eer ees eet ega egb egc ege egg ego egr egs egt egu eo- eoa eob eoc eoe eog eoo eor eos eot eou era erb erc ere erg ero err ers ert eru es- esa esb esc ese esg eso esr ess est esu eta etb etc ete etg eto etr ets ett etu eu- eua eub euc eue eug eur eus eut gaa gab gac gae gag gao gar gas gat gau gba gbc gbe gbg gbo gbr gbs gbt gbu gca gcb gcc gce gcg gco gcr gcs gct gcu ge- gea geb gec gee geg geo ger ges get geu gga ggb ggc ggg ggo ggr ggs ggt ggu goa gob goc goe gog goo gor gos got gou gra grb grc gre grg gro grr grs grt gru gsa gsb gsc gse gsg gso gsr gss gst gsu gta gtb gtc gte gtg gto gtr gts gtt gtu gu- gua gub guc gue gug guo gur gus gut guu oaa oab oac oae oag oao oar oas oat oau ob- oba obb obc obe obg obo obr obs obt obu oc- oca ocb occ ocg oco ocr ocs oct ocu oea oeb oec oee oeg oeo oer oes oet oga ogc oge ogg ogo ogs ogt oo- ooa oob ooc oog ooo oor oos oot or- ora orb orc ore org oro orr ors ort oru os- osa osb osc ose osg oso osr oss ost osu ot- ota otb otc ote otg oto otr ots ott otu ou- oua ouc oue ouo our ous out ra- raa rab rac rae rag rao rar ras rat rau rba rbb rbc rbe rbg rbo rbr rbs rbt rbu rca rcb rcc rce rcg rco rcr rcs rct rcu re- rea reb rec ree reg reo rer res ret reu rga rgb rgc rge rgg rgo rgr rgs rgt roa rob roc roe rog roo ror ros rot rou rra rrb rrc rrg rrr rrs rrt rru rsa rsb rsc rse rsg rso rsr rss rst rsu rta rtb rtc rte rtg rto rtr rts rtt rtu rua rub ruc rue rug ruo rur rus rut ruu saa sab sac sae sag sao sar sas sat sau sba sbb sbc sbe sbg sbo sbr sbs sbt sbu sca scb scc sce scg sco scr scs sct scu se- sea seb sec see seg seo ser ses set seu sga sgb sgc sge sgg sgo sgr sgs sgt sgu soa sob soc soe sog soo sor sos sot sou sr- sra srb src sre srg sro srr srs srt ss- ssa ssb ssc sse ssg sso ssr sss sst ssu sta stb stc ste stg sto str sts stt stu sua sub suc sue sug suo sur sus sut suu taa tab tac tae tag tao tar tas tat tau tba tbb tbc tbe tbg tbo tbr tbs tbt tbu tca tcb tcc tce tcg tco tcr tcs tct tcu te- tea teb tec tee teg teo ter tes tet teu tga tgb tgc tge tgg tgo tgr tgs tgt tgu to- toa tob toc toe tog too tor tos tot tou tra trb trc tre trg tro trr trs trt tru tsa tsb tsc tse tsg tso tsr tss tst tsu tta ttb ttc tte ttg tto ttr tts ttt ttu tua tub tuc tue tug tuo tur tus tut tuu ua- uaa uab uac uae uag uao uar uas uat uau uba ubb ubc ube ubg ubo ubr ubs ubt ubu uca ucb ucc uce ucg uco ucr ucs uct ucu uea ueb uec uee ueg uer ues uet uga ugb ugc uge ugg ugo ugr ugs ugt ugu uoa uob uoc uoe uog uoo uor uos uot ur- ura urb urc ure urg uro urr urs urt uru usa usb usc use usg uso usr uss ust usu uta utb utc ute uto