a-a a-c aaa aac aak aap aas ac- aca acc ack acp acs aka akc akk akp aks ap- apa apc apk app aps as- asa asc ask asp ass c-- caa cac cak cap cas cca ccc cck ccp ccs cka ckc cks cpa cpc cpk cpp cps csa csc csk csp css ka- kaa kac kak kap kas kca kcc kck kcp kcs kkc kkk kkp kks kpa kpc kpk kpp kps ksa ksc ksk ksp kss p-p paa pac pak pap pas pca pcc pck pcp pcs pka pkc pkp pks ppa ppc ppk ppp pps ps- psa psc psk psp pss saa sac sak sap sas sca scc sck scp scs sk- ska skc skk skp sks spa spc spk spp sps ss- ssa ssc ssk ssp sss