a-a a-b a-c a-t aaa aab aac aad aak aas aat ab- aba abb abc abd abk abs abt ac- aca acb acc acd ack acs act ad- ada adb adc add adk ads adt aka akb akc akd akk aks as- asa asb asc asd ask ass ast at- ata atb atc atd ats att baa bab bac bad bak bas bat bba bbb bbc bbd bbk bbs bbt bca bcb bcc bcd bck bcs bct bda bdb bdc bdd bdk bds bdt bka bkb bkc bkk bks bkt bsa bsb bsc bsd bsk bss bst bta btb btc btd btk bts btt c-- caa cab cac cad cak cas cat cba cbb cbc cbd cbk cbs cbt cca ccb ccc ccd cck ccs cct cda cdb cdc cdd cdk cds cdt cka ckb ckc ckd cks ckt csa csb csc csd csk css cst cta ctb ctc ctd ctk cts ctt daa dab dac dad dak das dat dba dbb dbc dbd dbk dbs dbt dca dcb dcc dcd dck dcs dct dda ddb ddc ddd ddk dds ddt dka dkb dkc dkk dks dkt dsa dsb dsc dsd dsk dss dst dta dtb dtc dtd dtk dts dtt k-t ka- kaa kab kac kad kak kas kat kba kbb kbc kbd kbk kbs kca kcb kcc kcd kck kcs kct kda kdb kdc kdk kds kdt kkb kkc kkk kks kkt ksa ksb ksc ksd ksk kss kst kta ktb ktc ktk kts ktt saa sab sac sad sak sas sat sba sbb sbc sbd sbk sbs sbt sca scb scc scd sck scs sct sda sdb sdc sdd sdk sds sdt sk- ska skb skc skd skk sks skt ss- ssa ssb ssc ssd ssk sss sst sta stb stc std stk sts stt taa tab tac tad tak tas tat tba tbb tbc tbd tbk tbs tbt tca tcb tcc tcd tck tcs tct tda tdb tdc tdd tdk tds tdt tka tkb tkc tkk tks tkt tsa tsb tsc tsd tsk tss tst tta ttb ttc ttd ttk tts ttt