a-a a-b a-c a-t aaa aab aac aam aao aas aat ab- aba abb abc abm abo abs abt ac- aca acb acc acm aco acs act ama amb amc amm amo ams amt aoa aob aoc aom aoo aos aot as- asa asb asc asm aso ass ast at- ata atb atc atm ato ats att baa bab bac bam bao bas bat bba bbb bbc bbm bbo bbs bbt bca bcb bcc bcm bco bcs bct bma bmb bmc bmm bmo bms bmt boa bob boc bom boo bos bot bsa bsb bsc bsm bso bss bst bta btb btc btm bto bts btt c-- caa cab cac cam cao cas cat cba cbb cbc cbm cbo cbs cbt cca ccb ccc ccm cco ccs cct cma cmb cmc cmm cmo cms cmt co- coa cob coc com coo cos cot csa csb csc csm cso css cst cta ctb ctc ctm cto cts ctt m-o maa mab mac mam mao mas mat mba mbb mbc mbm mbo mbs mbt mc- mca mcb mcc mcm mco mcs mct mma mmb mmc mmm mmo mms mmt moa mob moc mom moo mos mot msa msb msc msm mso mss mst mta mtb mtc mtm mto mts mtt oaa oab oac oam oao oas oat ob- oba obb obc obm obo obs obt oc- oca ocb occ ocm oco ocs oct om- oma omb omc omm omo oms omt oo- ooa oob ooc oom ooo oos oot os- osa osb osc osm oso oss ost ot- ota otb otc otm oto ots ott saa sab sac sam sao sas sat sba sbb sbc sbm sbo sbs sbt sca scb scc scm sco scs sct sma smb smc smm smo sms smt soa sob soc som soo sos sot ss- ssa ssb ssc ssm sso sss sst sta stb stc stm sto sts stt taa tab tac tam tao tas tat tba tbb tbc tbm tbo tbs tbt tca tcb tcc tcm tco tcs tct tma tmb tmc tmm tmo tms tmt to- toa tob toc tom too tos tot tsa tsb tsc tsm tso tss tst tta ttb ttc ttm tto tts ttt