-th a-a a-b a-c a-t aaa aab aac aae aah aas aat ab- aba abb abc abe abh abs abt ac- aca acb acc ace ach acs act aea aeb aec aee aeh aes aet aha ahb ahc ahe ahh ahs aht as- asa asb asc ase ash ass ast at- ata atb atc ate ath ats att baa bab bac bae bah bas bat bba bbb bbc bbe bbh bbs bbt bca bcb bcc bce bch bcs bct be- bea beb bec bee beh bes bet bha bhb bhc bhe bhh bhs bht bsa bsb bsc bse bsh bss bst bta btb btc bte bth bts btt c-- caa cab cac cae cah cas cat cba cbb cbc cbe cbh cbs cbt cca ccb ccc cce cch ccs cct ce- cea ceb cec cee ceh ces cet ch- cha chb chc che chh chs cht csa csb csc cse csh css cst cta ctb ctc cte cth cts ctt eaa eab eac eae eah eas eat eba ebb ebc ebe ebh ebs ebt ec- eca ecb ecc ece ech ecs ect eea eeb eec eee ees eet eha ehb ehc ehe ehh ehs eht es- esa esb esc ese esh ess est eta etb etc ete eth ets ett haa hab hac hae hah has hat hba hbb hbc hbe hbh hbs hbt hca hcb hcc hce hch hcs hct he- hea heb hec hee heh hes het hha hhb hhc hhe hhh hhs hht hsa hsb hsc hse hsh hss hst hta htb htc hte hth hts htt saa sab sac sae sah sas sat sba sbb sbc sbe sbh sbs sbt sca scb scc sce sch scs sct se- sea seb sec see seh ses set sh- sha shb shc she shh shs sht ss- ssa ssb ssc sse ssh sss sst sta stb stc ste sth sts stt taa tab tac tae tah tas tat tba tbb tbc tbe tbh tbs tbt tca tcb tcc tce tch tcs tct te- tea teb tec tee teh tes tet th- tha thb thc the thh ths tht tsa tsb tsc tse tsh tss tst tta ttb ttc tte tth tts ttt