a-a a-b a-c aaa aab aac aad aag aak aar aau ab- aba abb abc abd abg abk abr abu ac- aca acb acc acd acg ack acr acu ad- ada adb adc add adg adk adr adu ag- aga agb agc agd agg agk agr agu aka akb akc akd akg akk akr aku ar- ara arb arc ard arg ark arr aru au- aua aub auc aud aug auk aur b-u baa bab bac bad bag bak bar bau bba bbb bbc bbd bbg bbk bbr bbu bca bcb bcc bcd bcg bck bcr bcu bda bdb bdc bdd bdg bdk bdr bdu bga bgb bgc bgd bgg bgk bgr bgu bka bkb bkc bkg bkk bkr bra brb brd brg brk brr bru bua bub buc bud bug buk bur buu c-- caa cab cac cad cag cak car cau cba cbb cbc cbd cbg cbk cbr cbu cca ccb ccc ccd ccg cck ccr ccu cda cdb cdc cdd cdg cdk cdr cdu cga cgb cgc cgd cgg cgr cgu cka ckb ckc ckd cra crb crc crd crg crk crr cru cua cub cuc cud cug cuk cur cuu daa dab dac dad dag dak dar dau dba dbb dbc dbd dbg dbk dbr dbu dca dcb dcc dcd dcg dck dcr dcu dda ddb ddc ddd ddg ddk ddr ddu dga dgc dgd dgg dgk dgr dgu dka dkb dkc dkg dkk dkr dku dra drb drc drd drg drk drr dru dua dub duc dud dug duk dur g-d gaa gab gac gad gag gak gar gau gba gbc gbd gbg gbk gbr gbu gca gcb gcc gcd gcg gck gcr gcu gda gdb gdc gdd gdk gdr gdu gga ggb ggc ggd ggg ggr ggu gka gkb gkd gra grb grc grd grg grk grr gru gu- gua gub guc gud gug guk gur guu ka- kaa kab kac kad kag kak kar kau kba kbb kbc kbd kbk kbr kbu kca kcb kcc kcd kcg kck kcr kcu kda kdb kdc kdg kdk kdr kdu kga kgb kgc kgd kgu kkb kkc kkk kkr kku kra krc krd krg krk krr kru kub kuc kud kug kuk kur kuu ra- raa rab rac rad rag rak rar rau rba rbb rbc rbd rbg rbk rbr rbu rca rcb rcc rcd rcg rcr rcu rda rdb rdc rdd rdg rdr rdu rga rgb rgc rgd rgg rgk rgr rkb rkc rkg rkk rku rra rrb rrc rrd rrg rrk rrr rru rua rub ruc rud rug ruk rur ruu ua- uaa uab uac uad uag uak uar uau uba ubb ubc ubg ubk ubr ubu uca ucb ucc ucd ucg uck ucr ucu uda udb udc udd udg udk udr udu uga ugb ugc ugg ugk ugr ugu uka ukb ukc ukk ukr uku ur- ura urb urc urd urg urk urr uru uua uuc uug uur uuu