-th a-a a-b a-c a-t aaa aab aac aah aak aan aas aat ab- aba abb abc abh abk abn abs abt ac- aca acb acc ach ack acn acs act aha ahb ahc ahh ahk ahn ahs aht aka akb akc akh akk akn aks an- ana anb anc anh ank ann ans ant as- asa asb asc ash ask asn ass ast at- ata atb atc ath atn ats att baa bab bac bah bak ban bas bat bba bbb bbc bbh bbk bbn bbs bbt bca bcb bcc bch bck bcn bcs bct bha bhb bhc bhh bhk bhs bht bka bkb bkc bkk bkn bks bkt bna bnb bnc bnk bnn bns bnt bsa bsb bsc bsh bsk bsn bss bst bta btb btc bth btk btn bts btt c-- caa cab cac cah cak can cas cat cba cbb cbc cbh cbk cbn cbs cbt cca ccb ccc cch cck ccn ccs cct ch- cha chb chc chh chk chn chs cht cka ckb ckc ckh cks ckt cn- cna cnb cnc cnh cnn cns cnt csa csb csc csh csk csn css cst cta ctb ctc cth ctk ctn cts ctt haa hab hac hah hak han has hat hba hbb hbc hbh hbk hbn hbs hbt hca hcb hcc hch hck hcn hcs hct hha hhb hhc hhh hhk hhn hhs hht hka hkb hkh hkk hkn hks hkt hna hnb hnc hnh hnk hnn hns hnt hsa hsb hsc hsh hsk hsn hss hst hta htb htc hth htk htn hts htt k-t ka- kaa kab kac kah kak kan kas kat kba kbb kbc kbh kbk kbn kbs kca kcb kcc kch kck kcn kcs kct kha khh khk khn khs kkb kkc kkh kkk kkn kks kkt kn- kna knc knk knn knt ksa ksb ksc ksh ksk ksn kss kst kta ktb ktc kth ktk ktn kts ktt naa nab nac nah nak nan nas nat nba nbb nbc nbk nbn nbs nbt nca ncb ncc nch nck ncn ncs nct nha nhb nhc nhh nhk nhn nhs nht nka nkc nkk nkn nks nkt nna nnb nnc nnh nnk nnn nns nnt nsa nsb nsc nsh nsk nsn nss nst nta ntb ntc nth ntk ntn nts ntt saa sab sac sah sak san sas sat sba sbb sbc sbh sbk sbn sbs sbt sca scb scc sch sck scn scs sct sh- sha shb shc shh shk shn shs sht sk- ska skb skc skh skk sks skt sna snb snc snk snn sns snt ss- ssa ssb ssc ssh ssk ssn sss sst sta stb stc sth stk stn sts stt taa tab tac tah tak tan tas tat tba tbb tbc tbh tbk tbn tbs tbt tca tcb tcc tch tck tcn tcs tct th- tha thb thc thh thk thn ths tht tka tkb tkc tkk tks tkt tna tnb tnc tnh tnk tnn tns tnt tsa tsb tsc tsh tsk tsn tss tst tta ttb ttc tth ttk ttn tts ttt