a-a a-b a-c a-t aaa aab aac aam aao aar aas aat ab- aba abb abc abm abo abr abs abt ac- aca acb acc acm aco acr acs act ama amb amc amm amo amr ams amt aoa aob aoc aom aoo aor aos aot ar- ara arb arc arm aro arr ars art as- asa asb asc asm aso asr ass ast at- ata atb atc atm ato atr ats att baa bab bac bam bao bar bas bat bba bbb bbc bbm bbo bbr bbs bbt bca bcb bcc bcm bco bcr bcs bct bma bmb bmc bmm bmo bmr bms bmt boa bob boc bom boo bor bos bot bra brb brm bro brr brs brt bsa bsb bsc bsm bso bsr bss bst bta btb btc btm bto btr bts btt c-- caa cab cac cam cao car cas cat cba cbb cbc cbm cbo cbr cbs cbt cca ccb ccc ccm cco ccr ccs cct cma cmb cmc cmm cmo cmr cms cmt co- coa cob coc com coo cor cos cot cra crb crc crm cro crr crs crt csa csb csc csm cso csr css cst cta ctb ctc ctm cto ctr cts ctt m-o m-r maa mab mac mam mao mar mas mat mba mbb mbc mbm mbo mbr mbs mbt mc- mca mcb mcc mcm mco mcr mcs mct mma mmb mmc mmm mmo mmr mms mmt moa mob moc mom moo mor mos mot mra mrb mrc mrm mro mrr mrs mrt msa msb msc msm mso msr mss mst mta mtb mtc mtm mto mtr mts mtt oaa oab oac oam oao oar oas oat ob- oba obb obc obm obo obr obs obt oc- oca ocb occ ocm oco ocr ocs oct om- oma omb omc omm omo omr oms omt oo- ooa oob ooc oom ooo oor oos oot or- ora orb orc orm oro orr ors ort os- osa osb osc osm oso osr oss ost ot- ota otb otc otm oto otr ots ott ra- raa rab rac ram rao rar ras rat rba rbb rbc rbm rbo rbr rbs rbt rca rcb rcc rcm rco rcr rcs rct rma rmb rmc rmm rmo rmr rms rmt roa rob roc rom roo ror ros rot rra rrb rrc rrm rrr rrs rrt rsa rsb rsc rsm rso rsr rss rst rta rtb rtc rtm rto rtr rts rtt saa sab sac sam sao sar sas sat sba sbb sbc sbm sbo sbr sbs sbt sca scb scc scm sco scr scs sct sma smb smc smm smo smr sms smt soa sob soc som soo sor sos sot sr- sra srb src srm sro srr srs srt ss- ssa ssb ssc ssm sso ssr sss sst sta stb stc stm sto str sts stt taa tab tac tam tao tar tas tat tba tbb tbc tbm tbo tbr tbs tbt tca tcb tcc tcm tco tcr tcs tct tma tmb tmc tmm tmo tmr tms tmt to- toa tob toc tom too tor tos tot tra trb trc trm tro trr trs trt tsa tsb tsc tsm tso tsr tss tst tta ttb ttc ttm tto ttr tts ttt