a-a a-b a-c a-z aaa aab aac aag aak aao aar aaz ab- aba abb abc abg abk abo abr abz ac- aca acb acc acg ack aco acr acz ag- aga agb agc agg agk ago agr agz aka akb akc akg akk ako akr aoa aob aoc aog aok aoo aor ar- ara arb arc arg ark aro arr arz az- aza azb azg azo azz baa bab bac bag bak bao bar baz bba bbb bbc bbg bbk bbo bbr bca bcb bcc bcg bck bco bcr bcz bga bgb bgc bgg bgk bgo bgr bgz bka bkb bkc bkg bkk bko bkr boa bob boc bog bok boo bor boz bra brb brg brk bro brr brz bza bzo bzr bzz c-- caa cab cac cag cak cao car caz cba cbb cbc cbg cbk cbo cbr cbz cca ccb ccc ccg cck cco ccr ccz cga cgb cgc cgg cgo cgr cka ckb ckc cko co- coa cob coc cog cok coo cor coz cra crb crc crg crk cro crr crz cz- czc czk czo gaa gab gac gag gak gao gar gaz gba gbc gbg gbk gbo gbr gbz gca gcb gcc gcg gck gco gcr gga ggb ggc ggg ggo ggr ggz gka gkb gko goa gob goc gog gok goo gor goz gra grb grc grg grk gro grr gza gzo gzr k-z ka- kaa kab kac kag kak kao kar kaz kba kbb kbc kbk kbo kbr kbz kca kcb kcc kcg kck kcr kga kgb kgc kgo kkb kkc kkk kkr koa kob koc kog kok koo kor koz kra krc krg krk kro krr kzo oaa oab oac oag oak oao oar ob- oba obb obc obg obk obo obr oc- oca ocb occ ocg ock oco ocr ocz oga ogc ogg ogo oka okb okc okg okk oko okr oo- ooa oob ooc oog ook ooo oor or- ora orb orc org ork oro orr orz oza ozo ozz ra- raa rab rac rag rak rao rar raz rba rbb rbc rbg rbk rbo rbr rca rcb rcc rcg rco rcr rga rgb rgc rgg rgk rgo rgr rkb rkc rkg rkk rko rkz roa rob roc rog rok roo ror roz rra rrb rrc rrg rrk rrr rza rzb rzo z-g zaa zab zac zag zak zao zar zaz zbb zbc zbr zco zgb zgg zka zo- zoa zob zoc zog zok zoo zor zro zzr zzz