a-a a-c a-t aaa aac aae aan aap aas aat ac- aca acc ace acn acp acs act aea aec aee aen aep aes aet an- ana anc ane ann anp ans ant ap- apa apc ape apn app aps apt as- asa asc ase asn asp ass ast at- ata atc ate atn atp ats att c-- caa cac cae can cap cas cat cca ccc cce ccn ccp ccs cct ce- cea cec cee cen cep ces cet cn- cna cnc cne cnn cnp cns cnt cpa cpc cpe cpn cpp cps cpt csa csc cse csn csp css cst cta ctc cte ctn ctp cts ctt eaa eac eae ean eap eas eat ec- eca ecc ece ecn ecs ect eea eec eee een eep ees eet en- ena enc ene enn enp ens ent ep- epa epc epe epn epp eps ept es- esa esc ese esn esp ess est eta etc ete etn etp ets ett naa nac nae nan nap nas nat nca ncc nce ncn ncp ncs nct ne- nea nec nee nen nep nes net nna nnc nne nnn nnp nns nnt npa npc npe npn npp nps npt nsa nsc nse nsn nsp nss nst nta ntc nte ntn ntp nts ntt p-p paa pac pae pan pap pas pat pca pcc pce pcn pcp pcs pct pea pec pee pen pep pes pet pn- pna pnc pne pnn pnp pns pnt ppa ppc ppe ppn ppp pps ppt ps- psa psc pse psn psp pss pst pt- pta ptc pte ptn ptp pts ptt saa sac sae san sap sas sat sca scc sce scn scp scs sct se- sea sec see sen sep ses set sna snc sne snn snp sns snt spa spc spe spn spp sps spt ss- ssa ssc sse ssn ssp sss sst sta stc ste stn stp sts stt taa tac tae tan tap tas tat tca tcc tce tcn tcp tcs tct te- tea tec tee ten tep tes tet tna tnc tne tnn tnp tns tnt tpa tpc tpe tpn tpp tps tpt tsa tsc tse tsn tsp tss tst tta ttc tte ttn ttp tts ttt