a-a a-c aaa aac aae aak aan aap aas ac- aca acc ace ack acn acp acs aea aec aee aek aen aep aes aka akc ake akk akn akp aks an- ana anc ane ank ann anp ans ap- apa apc ape apk apn app aps as- asa asc ase ask asn asp ass c-- caa cac cae cak can cap cas cca ccc cce cck ccn ccp ccs ce- cea cec cee cek cen cep ces cka ckc cks cn- cna cnc cne cnn cnp cns cpa cpc cpe cpk cpn cpp cps csa csc cse csk csn csp css eaa eac eae eak ean eap eas ec- eca ecc ece eck ecn ecs eea eec eee eek een eep ees eka ekc eke ekp eks en- ena enc ene enk enn enp ens ep- epa epc epe epn epp eps es- esa esc ese esk esn esp ess ka- kaa kac kae kak kan kap kas kca kcc kce kck kcn kcp kcs ke- kea kec kee kek ken kep kes kkc kke kkk kkn kkp kks kn- kna knc kne knk knn knp kpa kpc kpe kpk kpn kpp kps ksa ksc kse ksk ksn ksp kss naa nac nae nak nan nap nas nca ncc nce nck ncn ncp ncs ne- nea nec nee nek nen nep nes nka nkc nke nkk nkn nkp nks nna nnc nne nnk nnn nnp nns npa npc npe npn npp nps nsa nsc nse nsk nsn nsp nss p-p paa pac pae pak pan pap pas pca pcc pce pck pcn pcp pcs pea pec pee pek pen pep pes pka pkc pke pkn pkp pks pn- pna pnc pne pnk pnn pnp pns ppa ppc ppe ppk ppn ppp pps ps- psa psc pse psk psn psp pss saa sac sae sak san sap sas sca scc sce sck scn scp scs se- sea sec see sek sen sep ses sk- ska skc ske skk skp sks sna snc sne snk snn snp sns spa spc spe spk spn spp sps ss- ssa ssc sse ssk ssn ssp sss