-th a-a a-b a-c a-t aaa aab aac aah aak aas aat ab- aba abb abc abh abk abs abt ac- aca acb acc ach ack acs act aha ahb ahc ahh ahk ahs aht aka akb akc akh akk aks as- asa asb asc ash ask ass ast at- ata atb atc ath ats att baa bab bac bah bak bas bat bba bbb bbc bbh bbk bbs bbt bca bcb bcc bch bck bcs bct bha bhb bhc bhh bhk bhs bht bka bkb bkc bkk bks bkt bsa bsb bsc bsh bsk bss bst bta btb btc bth btk bts btt c-- caa cab cac cah cak cas cat cba cbb cbc cbh cbk cbs cbt cca ccb ccc cch cck ccs cct ch- cha chb chc chh chk chs cht cka ckb ckc ckh cks ckt csa csb csc csh csk css cst cta ctb ctc cth ctk cts ctt haa hab hac hah hak has hat hba hbb hbc hbh hbk hbs hbt hca hcb hcc hch hck hcs hct hha hhb hhc hhh hhk hhs hht hka hkb hkh hkk hks hkt hsa hsb hsc hsh hsk hss hst hta htb htc hth htk hts htt k-t ka- kaa kab kac kah kak kas kat kba kbb kbc kbh kbk kbs kca kcb kcc kch kck kcs kct kha khh khk khs kkb kkc kkh kkk kks kkt ksa ksb ksc ksh ksk kss kst kta ktb ktc kth ktk kts ktt saa sab sac sah sak sas sat sba sbb sbc sbh sbk sbs sbt sca scb scc sch sck scs sct sh- sha shb shc shh shk shs sht sk- ska skb skc skh skk sks skt ss- ssa ssb ssc ssh ssk sss sst sta stb stc sth stk sts stt taa tab tac tah tak tas tat tba tbb tbc tbh tbk tbs tbt tca tcb tcc tch tck tcs tct th- tha thb thc thh thk ths tht tka tkb tkc tkk tks tkt tsa tsb tsc tsh tsk tss tst tta ttb ttc tth ttk tts ttt