a-a a-c a-t aaa aac aae aak aap aas aat ac- aca acc ace ack acp acs act aea aec aee aek aep aes aet aka akc ake akk akp aks ap- apa apc ape apk app aps apt as- asa asc ase ask asp ass ast at- ata atc ate atp ats att c-- caa cac cae cak cap cas cat cca ccc cce cck ccp ccs cct ce- cea cec cee cek cep ces cet cka ckc cks ckt cpa cpc cpe cpk cpp cps cpt csa csc cse csk csp css cst cta ctc cte ctk ctp cts ctt eaa eac eae eak eap eas eat ec- eca ecc ece eck ecs ect eea eec eee eek eep ees eet eka ekc eke ekp eks ekt ep- epa epc epe epp eps ept es- esa esc ese esk esp ess est eta etc ete etk etp ets ett k-t ka- kaa kac kae kak kap kas kat kca kcc kce kck kcp kcs kct ke- kea kec kee kek kep kes ket kkc kke kkk kkp kks kkt kpa kpc kpe kpk kpp kps kpt ksa ksc kse ksk ksp kss kst kta ktc kte ktk ktp kts ktt p-p paa pac pae pak pap pas pat pca pcc pce pck pcp pcs pct pea pec pee pek pep pes pet pka pkc pke pkp pks pkt ppa ppc ppe ppk ppp pps ppt ps- psa psc pse psk psp pss pst pt- pta ptc pte ptk ptp pts ptt saa sac sae sak sap sas sat sca scc sce sck scp scs sct se- sea sec see sek sep ses set sk- ska skc ske skk skp sks skt spa spc spe spk spp sps spt ss- ssa ssc sse ssk ssp sss sst sta stc ste stk stp sts stt taa tac tae tak tap tas tat tca tcc tce tck tcp tcs tct te- tea tec tee tek tep tes tet tka tkc tke tkk tkp tks tkt tpa tpc tpe tpk tpp tps tpt tsa tsc tse tsk tsp tss tst tta ttc tte ttk ttp tts ttt