a-a a-b a-c a-t aaa aab aac aam aan aao aar aat ab- aba abb abc abm abn abo abr abt ac- aca acb acc acm acn aco acr act ama amb amc amm amn amo amr amt an- ana anb anc anm ann ano anr ant aoa aob aoc aom aon aoo aor aot ar- ara arb arc arm arn aro arr art at- ata atb atc atm atn ato atr att baa bab bac bam ban bao bar bat bba bbb bbc bbm bbn bbo bbr bbt bca bcb bcc bcm bcn bco bcr bct bma bmb bmc bmm bmn bmo bmr bmt bna bnb bnc bnn bno bnr bnt boa bob boc bom bon boo bor bot bra brb brm brn bro brr brt bta btb btc btm btn bto btr btt c-- caa cab cac cam can cao car cat cba cbb cbc cbm cbn cbo cbr cbt cca ccb ccc ccm ccn cco ccr cct cma cmb cmc cmm cmn cmo cmr cmt cn- cna cnb cnc cnm cnn cno cnr cnt co- coa cob coc com con coo cor cot cra crb crc crm crn cro crr crt cta ctb ctc ctm ctn cto ctr ctt m-o m-r maa mab mac mam man mao mar mat mba mbb mbc mbm mbo mbr mbt mc- mca mcb mcc mcm mcn mco mcr mct mma mmb mmc mmm mmn mmo mmr mmt mna mnb mnc mnm mnn mno mnr mnt moa mob moc mom mon moo mor mot mra mrb mrc mrm mrn mro mrr mrt mta mtb mtc mtm mtn mto mtr mtt naa nab nac nam nan nao nar nat nba nbb nbc nbm nbn nbo nbr nbt nca ncb ncc ncm ncn nco ncr nct nma nmb nmc nmm nmn nmo nmr nmt nna nnb nnc nnm nnn nno nnt no- noa nob noc nom non noo nor not nra nrb nrc nrm nrn nro nrr nrt nta ntb ntc ntm ntn nto ntr ntt oaa oab oac oam oan oao oar oat ob- oba obb obc obm obn obo obr obt oc- oca ocb occ ocm ocn oco ocr oct om- oma omb omc omm omn omo omr omt on- ona onb onc onn ono onr ont oo- ooa oob ooc oom oon ooo oor oot or- ora orb orc orm orn oro orr ort ot- ota otb otc otm otn oto otr ott ra- raa rab rac ram ran rao rar rat rba rbb rbc rbm rbn rbo rbr rbt rca rcb rcc rcm rcn rco rcr rct rma rmb rmc rmm rmn rmo rmr rmt rna rnb rnc rnm rnn rno rnr rnt roa rob roc rom ron roo ror rot rra rrb rrc rrm rrn rrr rrt rta rtb rtc rtm rtn rto rtr rtt taa tab tac tam tan tao tar tat tba tbb tbc tbm tbn tbo tbr tbt tca tcb tcc tcm tcn tco tcr tct tma tmb tmc tmm tmn tmo tmr tmt tna tnb tnc tnm tnn tno tnr tnt to- toa tob toc tom ton too tor tot tra trb trc trm trn tro trr trt tta ttb ttc ttm ttn tto ttr ttt