a-a a-b a-t aaa aab aak aam aao aar aas aat ab- aba abb abk abm abo abr abs abt aka akb akk akm ako akr aks ama amb amk amm amo amr ams amt aoa aob aok aom aoo aor aos aot ar- ara arb ark arm aro arr ars art as- asa asb ask asm aso asr ass ast at- ata atb atm ato atr ats att baa bab bak bam bao bar bas bat bba bbb bbk bbm bbo bbr bbs bbt bka bkb bkk bkm bko bkr bks bkt bma bmb bmk bmm bmo bmr bms bmt boa bob bok bom boo bor bos bot bra brb brk brm bro brr brs brt bsa bsb bsk bsm bso bsr bss bst bta btb btk btm bto btr bts btt k-t ka- kaa kab kak kam kao kar kas kat kba kbb kbk kbm kbo kbr kbs kkb kkk kkm kkr kks kkt kma kmb kmk kmm kmo kms kmt koa kob kok kom koo kor kos kot kra krk kro krr krs krt ksa ksb ksk ksm kso ksr kss kst kta ktb ktk ktm kto ktr kts ktt m-o m-r maa mab mak mam mao mar mas mat mba mbb mbk mbm mbo mbr mbs mbt mka mkb mkk mkm mko mkr mks mkt mma mmb mmk mmm mmo mmr mms mmt moa mob mok mom moo mor mos mot mra mrb mrk mrm mro mrr mrs mrt msa msb msk msm mso msr mss mst mta mtb mtk mtm mto mtr mts mtt oaa oab oak oam oao oar oas oat ob- oba obb obk obm obo obr obs obt oka okb okk oko okr oks om- oma omb omm omo omr oms omt oo- ooa oob ook oom ooo oor oos oot or- ora orb ork orm oro orr ors ort os- osa osb osk osm oso osr oss ost ot- ota otb otk otm oto otr ots ott ra- raa rab rak ram rao rar ras rat rba rbb rbk rbm rbo rbr rbs rbt rkb rkk rkm rko rks rkt rma rmb rmm rmo rmr rms rmt roa rob rok rom roo ror ros rot rra rrb rrk rrm rrr rrs rrt rsa rsb rsk rsm rso rsr rss rst rta rtb rtk rtm rto rtr rts rtt saa sab sak sam sao sar sas sat sba sbb sbk sbm sbo sbr sbs sbt sk- ska skb skk skm sko skr sks skt sma smb smk smm smo smr sms smt soa sob sok som soo sor sos sot sr- sra srb srk srm sro srr srs srt ss- ssa ssb ssk ssm sso ssr sss sst sta stb stk stm sto str sts stt taa tab tak tam tao tar tas tat tba tbb tbk tbm tbo tbr tbs tbt tka tkb tkk tkm tko tkr tks tkt tma tmb tmk tmm tmo tmr tms tmt to- toa tob tok tom too tor tos tot tra trb trk trm tro trr trs trt tsa tsb tsk tsm tso tsr tss tst tta ttb ttk ttm tto ttr tts ttt