a-a a-b a-c a-t aaa aab aac aad aae aak aas aat ab- aba abb abc abd abe abk abs abt ac- aca acb acc acd ace ack acs act ad- ada adb adc add ade adk ads adt aea aeb aec aed aee aek aes aet aka akb akc akd ake akk aks as- asa asb asc asd ase ask ass ast at- ata atb atc atd ate ats att baa bab bac bad bae bak bas bat bba bbb bbc bbd bbe bbk bbs bbt bca bcb bcc bcd bce bck bcs bct bda bdb bdc bdd bde bdk bds bdt be- bea beb bec bed bee bek bes bet bka bkb bkc bke bkk bks bkt bsa bsb bsc bsd bse bsk bss bst bta btb btc btd bte btk bts btt c-- caa cab cac cad cae cak cas cat cba cbb cbc cbd cbe cbk cbs cbt cca ccb ccc ccd cce cck ccs cct cda cdb cdc cdd cde cdk cds cdt ce- cea ceb cec ced cee cek ces cet cka ckb ckc ckd cks ckt csa csb csc csd cse csk css cst cta ctb ctc ctd cte ctk cts ctt daa dab dac dad dae dak das dat dba dbb dbc dbd dbe dbk dbs dbt dca dcb dcc dcd dce dck dcs dct dda ddb ddc ddd dde ddk dds ddt de- dea deb dec ded dee dek des det dka dkb dkc dke dkk dks dkt dsa dsb dsc dsd dse dsk dss dst dta dtb dtc dtd dte dtk dts dtt eaa eab eac ead eae eak eas eat eba ebb ebc ebd ebe ebk ebs ebt ec- eca ecb ecc ecd ece eck ecs ect ed- eda edb edc edd ede edk eds edt eea eeb eec eed eee eek ees eet eka ekb ekc ekd eke eks ekt es- esa esb esc esd ese esk ess est eta etb etc etd ete etk ets ett k-t ka- kaa kab kac kad kae kak kas kat kba kbb kbc kbd kbe kbk kbs kca kcb kcc kcd kce kck kcs kct kda kdb kdc kde kdk kds kdt ke- kea keb kec ked kee kek kes ket kkb kkc kke kkk kks kkt ksa ksb ksc ksd kse ksk kss kst kta ktb ktc kte ktk kts ktt saa sab sac sad sae sak sas sat sba sbb sbc sbd sbe sbk sbs sbt sca scb scc scd sce sck scs sct sda sdb sdc sdd sde sdk sds sdt se- sea seb sec sed see sek ses set sk- ska skb skc skd ske skk sks skt ss- ssa ssb ssc ssd sse ssk sss sst sta stb stc std ste stk sts stt taa tab tac tad tae tak tas tat tba tbb tbc tbd tbe tbk tbs tbt tca tcb tcc tcd tce tck tcs tct tda tdb tdc tdd tde tdk tds tdt te- tea teb tec ted tee tek tes tet tka tkb tkc tke tkk tks tkt tsa tsb tsc tsd tse tsk tss tst tta ttb ttc ttd tte ttk tts ttt