a-a a-b a-c a-t aaa aab aac aad aae aak aan aas aat ab- aba abb abc abd abe abk abn abs abt ac- aca acb acc acd ace ack acn acs act ad- ada adb adc add ade adk adn ads adt aea aeb aec aed aee aek aen aes aet aka akb akc akd ake akk akn aks an- ana anb anc and ane ank ann ans ant as- asa asb asc asd ase ask asn ass ast at- ata atb atc atd ate atn ats att baa bab bac bad bae bak ban bas bat bba bbb bbc bbd bbe bbk bbn bbs bbt bca bcb bcc bcd bce bck bcn bcs bct bda bdb bdc bdd bde bdk bds bdt be- bea beb bec bed bee bek ben bes bet bka bkb bkc bke bkk bkn bks bkt bna bnb bnc bnd bne bnk bnn bns bnt bsa bsb bsc bsd bse bsk bsn bss bst bta btb btc btd bte btk btn bts btt c-- caa cab cac cad cae cak can cas cat cba cbb cbc cbd cbe cbk cbn cbs cbt cca ccb ccc ccd cce cck ccn ccs cct cda cdb cdc cdd cde cdk cdn cds cdt ce- cea ceb cec ced cee cek cen ces cet cka ckb ckc ckd cks ckt cn- cna cnb cnc cnd cne cnn cns cnt csa csb csc csd cse csk csn css cst cta ctb ctc ctd cte ctk ctn cts ctt daa dab dac dad dae dak dan das dat dba dbb dbc dbd dbe dbk dbn dbs dbt dca dcb dcc dcd dce dck dcn dcs dct dda ddb ddc ddd dde ddk ddn dds ddt de- dea deb dec ded dee dek den des det dka dkb dkc dke dkk dks dkt dna dnb dnc dnd dne dnk dnn dns dnt dsa dsb dsc dsd dse dsk dsn dss dst dta dtb dtc dtd dte dtk dtn dts dtt eaa eab eac ead eae eak ean eas eat eba ebb ebc ebd ebe ebk ebn ebs ebt ec- eca ecb ecc ecd ece eck ecn ecs ect ed- eda edb edc edd ede edk edn eds edt eea eeb eec eed eee eek een ees eet eka ekb ekc ekd eke eks ekt en- ena enb enc end ene enk enn ens ent es- esa esb esc esd ese esk esn ess est eta etb etc etd ete etk etn ets ett k-t ka- kaa kab kac kad kae kak kan kas kat kba kbb kbc kbd kbe kbk kbn kbs kca kcb kcc kcd kce kck kcn kcs kct kda kdb kdc kde kdk kds kdt ke- kea keb kec ked kee kek ken kes ket kkb kkc kke kkk kkn kks kkt kn- kna knc knd kne knk knn knt ksa ksb ksc ksd kse ksk ksn kss kst kta ktb ktc kte ktk ktn kts ktt naa nab nac nad nae nak nan nas nat nba nbb nbc nbd nbe nbk nbn nbs nbt nca ncb ncc ncd nce nck ncn ncs nct nda ndb ndc ndd nde ndk ndn nds ndt ne- nea neb nec ned nee nek nen nes net nka nkc nke nkk nkn nks nkt nna nnb nnc nne nnk nnn nns nnt nsa nsb nsc nsd nse nsk nsn nss nst nta ntb ntc ntd nte ntk ntn nts ntt saa sab sac sad sae sak san sas sat sba sbb sbc sbd sbe sbk sbn sbs sbt sca scb scc scd sce sck scn scs sct sda sdb sdc sdd sde sdk sdn sds sdt se- sea seb sec sed see sek sen ses set sk- ska skb skc skd ske skk sks skt sna snb snc snd sne snk snn sns snt ss- ssa ssb ssc ssd sse ssk ssn sss sst sta stb stc std ste stk stn sts stt taa tab tac tad tae tak tan tas tat tba tbb tbc tbd tbe tbk tbn tbs tbt tca tcb tcc tcd tce tck tcn tcs tct tda tdb tdc tdd tde tdk tdn tds tdt te- tea teb tec ted tee tek ten tes tet tka tkb tkc tke tkk tks tkt tna tnb tnc tnd tne tnk tnn tns tnt tsa tsb tsc tsd tse tsk tsn tss tst tta ttb ttc ttd tte ttk ttn tts ttt