-er a-a a-b a-c aaa aab aac aae aag aak aar aau ab- aba abb abc abe abg abk abr abu ac- aca acb acc ace acg ack acr acu aea aeb aec aee aeg aek aer aeu ag- aga agb agc age agg agk agr agu aka akb akc ake akg akk akr aku ar- ara arb arc are arg ark arr aru au- aua aub auc aue aug auk aur b-u baa bab bac bae bag bak bar bau bba bbb bbc bbe bbg bbk bbr bbu bca bcb bcc bce bcg bck bcr bcu be- bea beb bec bee beg bek ber beu bga bgb bgc bge bgg bgk bgr bgu bka bkb bkc bke bkg bkk bkr bra brb bre brg brk brr bru bua bub buc bue bug buk bur buu c-- caa cab cac cae cag cak car cau cba cbb cbc cbe cbg cbk cbr cbu cca ccb ccc cce ccg cck ccr ccu ce- cea ceb cec cee ceg cek cer ceu cga cgb cgc cge cgg cgr cgu cka ckb ckc cra crb crc cre crg crk crr cru cua cub cuc cue cug cuk cur cuu eaa eab eac eae eag eak ear eau eba ebb ebc ebe ebg ebk ebr ebu ec- eca ecb ecc ece ecg eck ecr ecu eea eeb eec eee eeg eek eer ega egb egc ege egg egr egu eka ekb ekc eke ekg ekr eku era erb erc ere erg erk err eru eu- eua eub euc eue eug eur gaa gab gac gae gag gak gar gau gba gbc gbe gbg gbk gbr gbu gca gcb gcc gce gcg gck gcr gcu ge- gea geb gec gee geg gek ger geu gga ggb ggc ggg ggr ggu gka gkb gra grb grc gre grg grk grr gru gu- gua gub guc gue gug guk gur guu ka- kaa kab kac kae kag kak kar kau kba kbb kbc kbe kbk kbr kbu kca kcb kcc kce kcg kck kcr kcu ke- kea keb kec kee keg kek ker kga kgb kgc kgu kkb kkc kke kkk kkr kku kra krc krg krk krr kru kub kuc kue kug kuk kur kuu ra- raa rab rac rae rag rak rar rau rba rbb rbc rbe rbg rbk rbr rbu rca rcb rcc rce rcg rcr rcu re- rea reb rec ree reg rek rer reu rga rgb rgc rge rgg rgk rgr rkb rkc rke rkg rkk rku rra rrb rrc rrg rrk rrr rru rua rub ruc rue rug ruk rur ruu ua- uaa uab uac uae uag uak uar uau uba ubb ubc ube ubg ubk ubr ubu uca ucb ucc uce ucg uck ucr ucu uea ueb uec uee ueg uer uga ugb ugc uge ugg ugk ugr ugu uka ukb ukc uke ukk ukr uku ur- ura urb urc ure urg urk urr uru uua uuc uue uug uur uuu

a-ak a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aack aacr aacu aaea aaec aage aaka aake aaku aara aarc aare aaru abaa abab abac abae abag abak abar abau abb- abba abbb abbe abbr abca abcb abcc abcr abec abee aber abra abrc abua abue abug abuk acaa acab acac acae acag acar acba acca accc acce accu ace- acea acec acek acer acga acgr acke acr- acra acrc acre acrr acu- acue acur aeac aecb aeer aega aeka aer- aera aerc agac agag agar agau agba agca agcc agce agea agee ager agga agge aggu agra agre agua ague agur akaa akae akar akca akee akeg aker akeu akka akku akr- akra akre akua arab arac arae arag arak arar arau arba arbe arc- arca arce area arec aree areg arek areu arga argb arge arka arke arr- arra arrc arre arrg arrk arrr arru arua arub arue arug auaa aube auca auce auer auga auge auke aur- aura aure auug baaa baak baar baba babb babe babr babu bac- baca bacc bace back baek baer baga bage bagg bak- baka bake bakr baku bar- bara barb barc bare barg bark barr baru bau- baug bauk baur bbau bbbb bbeb bbga bbrc bbrg bcaa bcar bcbc bcbg bcca bccc bcec bcer bcra bcru bcuc beag beak bear beau beba bebb bebe beca beck becu beeb beeg beek beer bega begg begu beka beke bera berc bere berg berk berr beru beuk beur bgca brab brac brae brag brak brau brca brcb brce brea breb brec bree breg brek brer brka brkb brrr bruc brue brug buar buba bubb bube bubu buca bucc buce buck bucu buea buer bueu buga buge bugg buka buke bukk buku bur- bura burb bure burg burk burr buru caaa caab caac caba cabe cabg cabu cac- caca cacc cace cack cacr caec caer caeu caga cage cagg cagr caka cake cara carb carc care cark carr cauc cauk cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbea cbec cbee cber cbga cbgb cbka cbkg cbkr cbre ccaa ccab ccac ccag ccar ccba ccbc ccca cccb cccc cccu ccee ccga ccgc ccra ccrc ccre ccrg ccuc ceac cear ceba cebu cec- ceca cece ceeb ceec cege ceke cer- cera cerc cere cgac cgcc cgcg cger ckac ckbc ckbe ckck cker ckga ckrc crab crac crag crar crau crbc crbu crca crcc crce crcr cre- crea creb crec cree creg creu crkc crub crue crug cruk cuau cub- cuba cubb cube cuca cucc cuce cuck cuek cuer cuga cuk- cuka cuke cura curb cure curr eaba eaca eacc eaec eaga eage eara earb eare ebac ebba ebbc ebbr ebcc eber ebru ebur ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce ecka ecra ecrc ecrr ecru ecua eeca eeea eeee eega eeka eeke eera eerc eerg egaa egae egar egba egbe egbu egcc egcg egcr egea egec egee eger eggb egge egra egre eka- ekab ekeb ekek eker ekka ekur erau erba erbb erbe erca ercc erce ereb erec