a-a a-c a-t aaa aac aae aak aan aap aas aat ac- aca acc ace ack acn acp acs act aea aec aee aek aen aep aes aet aka akc ake akk akn akp aks an- ana anc ane ank ann anp ans ant ap- apa apc ape apk apn app aps apt as- asa asc ase ask asn asp ass ast at- ata atc ate atn atp ats att c-- caa cac cae cak can cap cas cat cca ccc cce cck ccn ccp ccs cct ce- cea cec cee cek cen cep ces cet cka ckc cks ckt cn- cna cnc cne cnn cnp cns cnt cpa cpc cpe cpk cpn cpp cps cpt csa csc cse csk csn csp css cst cta ctc cte ctk ctn ctp cts ctt eaa eac eae eak ean eap eas eat ec- eca ecc ece eck ecn ecs ect eea eec eee eek een eep ees eet eka ekc eke ekp eks ekt en- ena enc ene enk enn enp ens ent ep- epa epc epe epn epp eps ept es- esa esc ese esk esn esp ess est eta etc ete etk etn etp ets ett k-t ka- kaa kac kae kak kan kap kas kat kca kcc kce kck kcn kcp kcs kct ke- kea kec kee kek ken kep kes ket kkc kke kkk kkn kkp kks kkt kn- kna knc kne knk knn knp knt kpa kpc kpe kpk kpn kpp kps kpt ksa ksc kse ksk ksn ksp kss kst kta ktc kte ktk ktn ktp kts ktt naa nac nae nak nan nap nas nat nca ncc nce nck ncn ncp ncs nct ne- nea nec nee nek nen nep nes net nka nkc nke nkk nkn nkp nks nkt nna nnc nne nnk nnn nnp nns nnt npa npc npe npn npp nps npt nsa nsc nse nsk nsn nsp nss nst nta ntc nte ntk ntn ntp nts ntt p-p paa pac pae pak pan pap pas pat pca pcc pce pck pcn pcp pcs pct pea pec pee pek pen pep pes pet pka pkc pke pkn pkp pks pkt pn- pna pnc pne pnk pnn pnp pns pnt ppa ppc ppe ppk ppn ppp pps ppt ps- psa psc pse psk psn psp pss pst pt- pta ptc pte ptk ptn ptp pts ptt saa sac sae sak san sap sas sat sca scc sce sck scn scp scs sct se- sea sec see sek sen sep ses set sk- ska skc ske skk skp sks skt sna snc sne snk snn snp sns snt spa spc spe spk spn spp sps spt ss- ssa ssc sse ssk ssn ssp sss sst sta stc ste stk stn stp sts stt taa tac tae tak tan tap tas tat tca tcc tce tck tcn tcp tcs tct te- tea tec tee tek ten tep tes tet tka tkc tke tkk tkp tks tkt tna tnc tne tnk tnn tnp tns tnt tpa tpc tpe tpk tpn tpp tps tpt tsa tsc tse tsk tsn tsp tss tst tta ttc tte ttk ttn ttp tts ttt