-th a-a a-b a-c a-t aaa aab aac aah aao aas aat ab- aba abb abc abh abo abs abt ac- aca acb acc ach aco acs act aha ahb ahc ahh aho ahs aht aoa aob aoc aoh aoo aos aot as- asa asb asc ash aso ass ast at- ata atb atc ath ato ats att baa bab bac bah bao bas bat bba bbb bbc bbh bbo bbs bbt bca bcb bcc bch bco bcs bct bha bhb bhc bhh bho bhs bht boa bob boc boh boo bos bot bsa bsb bsc bsh bso bss bst bta btb btc bth bto bts btt c-- caa cab cac cah cao cas cat cba cbb cbc cbh cbo cbs cbt cca ccb ccc cch cco ccs cct ch- cha chb chc chh cho chs cht co- coa cob coc coh coo cos cot csa csb csc csh cso css cst cta ctb ctc cth cto cts ctt haa hab hac hah hao has hat hba hbb hbc hbh hbo hbs hbt hca hcb hcc hch hco hcs hct hha hhb hhc hhh hho hhs hht hoa hob hoc hoh hoo hos hot hsa hsb hsc hsh hss hst hta htb htc hth hto hts htt oaa oab oac oah oao oas oat ob- oba obb obc obh obo obs obt oc- oca ocb occ och oco ocs oct oha ohc ohh oho ohs oht oo- ooa oob ooc ooh ooo oos oot os- osa osb osc osh oso oss ost ot- ota otb otc oth oto ots ott saa sab sac sah sao sas sat sba sbb sbc sbh sbo sbs sbt sca scb scc sch sco scs sct sh- sha shb shc shh sho shs sht soa sob soc soh soo sos sot ss- ssa ssb ssc ssh sso sss sst sta stb stc sth sto sts stt taa tab tac tah tao tas tat tba tbb tbc tbh tbo tbs tbt tca tcb tcc tch tco tcs tct th- tha thb thc thh tho ths tht to- toa tob toc toh too tos tot tsa tsb tsc tsh tso tss tst tta ttb ttc tth tto tts ttt