a-a a-b a-c a-t aaa aab aac aak aam aao aas aat ab- aba abb abc abk abm abo abs abt ac- aca acb acc ack acm aco acs act aka akb akc akk akm ako aks ama amb amc amk amm amo ams amt aoa aob aoc aok aom aoo aos aot as- asa asb asc ask asm aso ass ast at- ata atb atc atm ato ats att baa bab bac bak bam bao bas bat bba bbb bbc bbk bbm bbo bbs bbt bca bcb bcc bck bcm bco bcs bct bka bkb bkc bkk bkm bko bks bkt bma bmb bmc bmk bmm bmo bms bmt boa bob boc bok bom boo bos bot bsa bsb bsc bsk bsm bso bss bst bta btb btc btk btm bto bts btt c-- caa cab cac cak cam cao cas cat cba cbb cbc cbk cbm cbo cbs cbt cca ccb ccc cck ccm cco ccs cct cka ckb ckc ckm cko cks ckt cma cmb cmc cmk cmm cmo cms cmt co- coa cob coc cok com coo cos cot csa csb csc csk csm cso css cst cta ctb ctc ctk ctm cto cts ctt k-t ka- kaa kab kac kak kam kao kas kat kba kbb kbc kbk kbm kbo kbs kca kcb kcc kck kcm kcs kct kkb kkc kkk kkm kks kkt kma kmb kmc kmk kmm kmo kms kmt koa kob koc kok kom koo kos kot ksa ksb ksc ksk ksm kso kss kst kta ktb ktc ktk ktm kto kts ktt m-o maa mab mac mak mam mao mas mat mba mbb mbc mbk mbm mbo mbs mbt mc- mca mcb mcc mck mcm mco mcs mct mka mkb mkc mkk mkm mko mks mkt mma mmb mmc mmk mmm mmo mms mmt moa mob moc mok mom moo mos mot msa msb msc msk msm mso mss mst mta mtb mtc mtk mtm mto mts mtt oaa oab oac oak oam oao oas oat ob- oba obb obc obk obm obo obs obt oc- oca ocb occ ock ocm oco ocs oct oka okb okc okk oko oks om- oma omb omc omm omo oms omt oo- ooa oob ooc ook oom ooo oos oot os- osa osb osc osk osm oso oss ost ot- ota otb otc otk otm oto ots ott saa sab sac sak sam sao sas sat sba sbb sbc sbk sbm sbo sbs sbt sca scb scc sck scm sco scs sct sk- ska skb skc skk skm sko sks skt sma smb smc smk smm smo sms smt soa sob soc sok som soo sos sot ss- ssa ssb ssc ssk ssm sso sss sst sta stb stc stk stm sto sts stt taa tab tac tak tam tao tas tat tba tbb tbc tbk tbm tbo tbs tbt tca tcb tcc tck tcm tco tcs tct tka tkb tkc tkk tkm tko tks tkt tma tmb tmc tmk tmm tmo tms tmt to- toa tob toc tok tom too tos tot tsa tsb tsc tsk tsm tso tss tst tta ttb ttc ttk ttm tto tts ttt