a-a a-c a-t aaa aac aae aak aan aao aas aat ac- aca acc ace ack acn aco acs act aea aec aee aek aen aeo aes aet aka akc ake akk akn ako aks an- ana anc ane ank ann ano ans ant aoa aoc aoe aok aon aoo aos aot as- asa asc ase ask asn aso ass ast at- ata atc ate atn ato ats att c-- caa cac cae cak can cao cas cat cca ccc cce cck ccn cco ccs cct ce- cea cec cee cek cen ceo ces cet cka ckc cko cks ckt cn- cna cnc cne cnn cno cns cnt co- coa coc coe cok con coo cos cot csa csc cse csk csn cso css cst cta ctc cte ctk ctn cto cts ctt eaa eac eae eak ean eao eas eat ec- eca ecc ece eck ecn eco ecs ect eea eec eee eek een eeo ees eet eka ekc eke eko eks ekt en- ena enc ene enk enn eno ens ent eo- eoa eoc eoe eok eon eoo eos eot es- esa esc ese esk esn eso ess est eta etc ete etk etn eto ets ett k-t ka- kaa kac kae kak kan kao kas kat kca kcc kce kck kcn kcs kct ke- kea kec kee kek ken keo kes ket kkc kke kkk kkn kks kkt kn- kna knc kne knk knn kno knt koa koc koe kok kon koo kos kot ksa ksc kse ksk ksn kso kss kst kta ktc kte ktk ktn kto kts ktt naa nac nae nak nan nao nas nat nca ncc nce nck ncn nco ncs nct ne- nea nec nee nek nen neo nes net nka nkc nke nkk nkn nko nks nkt nna nnc nne nnk nnn nno nns nnt no- noa noc noe nok non noo nos not nsa nsc nse nsk nsn nso nss nst nta ntc nte ntk ntn nto nts ntt oaa oac oae oak oan oao oas oat oc- oca occ ock ocn oco ocs oct oea oec oee oen oeo oes oet oka okc oke okk oko oks on- ona onc one onk onn ono ons ont oo- ooa ooc ook oon ooo oos oot os- osa osc ose osk osn oso oss ost ot- ota otc ote otk otn oto ots ott saa sac sae sak san sao sas sat sca scc sce sck scn sco scs sct se- sea sec see sek sen seo ses set sk- ska skc ske skk sko sks skt sna snc sne snk snn sno sns snt soa soc soe sok son soo sos sot ss- ssa ssc sse ssk ssn sso sss sst sta stc ste stk stn sto sts stt taa tac tae tak tan tao tas tat tca tcc tce tck tcn tco tcs tct te- tea tec tee tek ten teo tes tet tka tkc tke tkk tko tks tkt tna tnc tne tnk tnn tno tns tnt to- toa toc toe tok ton too tos tot tsa tsc tse tsk tsn tso tss tst tta ttc tte ttk ttn tto tts ttt