-er a-a a-b a-c a-t aaa aab aac aae aag aak aar aat aau ab- aba abb abc abe abg abk abr abt abu ac- aca acb acc ace acg ack acr act acu aea aeb aec aee aeg aek aer aet aeu ag- aga agb agc age agg agk agr agt agu aka akb akc ake akg akk akr aku ar- ara arb arc are arg ark arr art aru at- ata atb atc ate atg atr att atu au- aua aub auc aue aug auk aur aut b-u baa bab bac bae bag bak bar bat bau bba bbb bbc bbe bbg bbk bbr bbt bbu bca bcb bcc bce bcg bck bcr bct bcu be- bea beb bec bee beg bek ber bet beu bga bgb bgc bge bgg bgk bgr bgt bgu bka bkb bkc bke bkg bkk bkr bkt bra brb bre brg brk brr brt bru bta btb btc bte btg btk btr btt btu bua bub buc bue bug buk bur but buu c-- caa cab cac cae cag cak car cat cau cba cbb cbc cbe cbg cbk cbr cbt cbu cca ccb ccc cce ccg cck ccr cct ccu ce- cea ceb cec cee ceg cek cer cet ceu cga cgb cgc cge cgg cgr cgt cgu cka ckb ckc ckt cra crb crc cre crg crk crr crt cru cta ctb ctc cte ctg ctk ctr ctt ctu cua cub cuc cue cug cuk cur cut cuu eaa eab eac eae eag eak ear eat eau eba ebb ebc ebe ebg ebk ebr ebt ebu ec- eca ecb ecc ece ecg eck ecr ect ecu eea eeb eec eee eeg eek eer eet ega egb egc ege egg egr egt egu eka ekb ekc eke ekg ekr ekt eku era erb erc ere erg erk err ert eru eta etb etc ete etg etk etr ett etu eu- eua eub euc eue eug eur eut gaa gab gac gae gag gak gar gat gau gba gbc gbe gbg gbk gbr gbt gbu gca gcb gcc gce gcg gck gcr gct gcu ge- gea geb gec gee geg gek ger get geu gga ggb ggc ggg ggr ggt ggu gka gkb gkt gra grb grc gre grg grk grr grt gru gta gtb gtc gte gtg gtk gtr gtt gtu gu- gua gub guc gue gug guk gur gut guu k-t ka- kaa kab kac kae kag kak kar kat kau kba kbb kbc kbe kbk kbr kbu kca kcb kcc kce kcg kck kcr kct kcu ke- kea keb kec kee keg kek ker ket kga kgb kgc kgu kkb kkc kke kkk kkr kkt kku kra krc krg krk krr krt kru kta ktb ktc kte ktg ktk ktr ktt ktu kub kuc kue kug kuk kur kut kuu ra- raa rab rac rae rag rak rar rat rau rba rbb rbc rbe rbg rbk rbr rbt rbu rca rcb rcc rce rcg rcr rct rcu re- rea reb rec ree reg rek rer ret reu rga rgb rgc rge rgg rgk rgr rgt rkb rkc rke rkg rkk rkt rku rra rrb rrc rrg rrk rrr rrt rru rta rtb rtc rte rtg rtk rtr rtt rtu rua rub ruc rue rug ruk rur rut ruu taa tab tac tae tag tak tar tat tau tba tbb tbc tbe tbg tbk tbr tbt tbu tca tcb tcc tce tcg tck tcr tct tcu te- tea teb tec tee teg tek ter tet teu tga tgb tgc tge tgg tgk tgr tgt tgu tka tkb tkc tke tkg tkk tkr tkt tra trb trc tre trg trk trr trt tru tta ttb ttc tte ttg ttk ttr ttt ttu tua tub tuc tue tug tuk tur tut tuu ua- uaa uab uac uae uag uak uar uat uau uba ubb ubc ube ubg ubk ubr ubt ubu uca ucb ucc uce ucg uck ucr uct ucu uea ueb uec uee ueg uer uet uga ugb ugc uge ugg ugk ugr ugt ugu uka ukb ukc uke ukk ukr uku ur- ura urb urc ure urg urk urr urt uru uta utb utc ute utk utr utt utu uua uuc uue uug uur uut uuu