a-a a-b a-c a-t aaa aab aac aak aam aao aar aat ab- aba abb abc abk abm abo abr abt ac- aca acb acc ack acm aco acr act aka akb akc akk akm ako akr ama amb amc amk amm amo amr amt aoa aob aoc aok aom aoo aor aot ar- ara arb arc ark arm aro arr art at- ata atb atc atm ato atr att baa bab bac bak bam bao bar bat bba bbb bbc bbk bbm bbo bbr bbt bca bcb bcc bck bcm bco bcr bct bka bkb bkc bkk bkm bko bkr bkt bma bmb bmc bmk bmm bmo bmr bmt boa bob boc bok bom boo bor bot bra brb brk brm bro brr brt bta btb btc btk btm bto btr btt c-- caa cab cac cak cam cao car cat cba cbb cbc cbk cbm cbo cbr cbt cca ccb ccc cck ccm cco ccr cct cka ckb ckc ckm cko ckt cma cmb cmc cmk cmm cmo cmr cmt co- coa cob coc cok com coo cor cot cra crb crc crk crm cro crr crt cta ctb ctc ctk ctm cto ctr ctt k-t ka- kaa kab kac kak kam kao kar kat kba kbb kbc kbk kbm kbo kbr kca kcb kcc kck kcm kcr kct kkb kkc kkk kkm kkr kkt kma kmb kmc kmk kmm kmo kmt koa kob koc kok kom koo kor kot kra krc krk kro krr krt kta ktb ktc ktk ktm kto ktr ktt m-o m-r maa mab mac mak mam mao mar mat mba mbb mbc mbk mbm mbo mbr mbt mc- mca mcb mcc mck mcm mco mcr mct mka mkb mkc mkk mkm mko mkr mkt mma mmb mmc mmk mmm mmo mmr mmt moa mob moc mok mom moo mor mot mra mrb mrc mrk mrm mro mrr mrt mta mtb mtc mtk mtm mto mtr mtt oaa oab oac oak oam oao oar oat ob- oba obb obc obk obm obo obr obt oc- oca ocb occ ock ocm oco ocr oct oka okb okc okk oko okr om- oma omb omc omm omo omr omt oo- ooa oob ooc ook oom ooo oor oot or- ora orb orc ork orm oro orr ort ot- ota otb otc otk otm oto otr ott ra- raa rab rac rak ram rao rar rat rba rbb rbc rbk rbm rbo rbr rbt rca rcb rcc rcm rco rcr rct rkb rkc rkk rkm rko rkt rma rmb rmc rmm rmo rmr rmt roa rob roc rok rom roo ror rot rra rrb rrc rrk rrm rrr rrt rta rtb rtc rtk rtm rto rtr rtt taa tab tac tak tam tao tar tat tba tbb tbc tbk tbm tbo tbr tbt tca tcb tcc tck tcm tco tcr tct tka tkb tkc tkk tkm tko tkr tkt tma tmb tmc tmk tmm tmo tmr tmt to- toa tob toc tok tom too tor tot tra trb trc trk trm tro trr trt tta ttb ttc ttk ttm tto ttr ttt