a-a a-c aaa aac aak aan aas ac- aca acc ack acn acs aka akc akk akn aks an- ana anc ank ann ans as- asa asc ask asn ass c-- caa cac cak can cas cca ccc cck ccn ccs cka ckc cks cn- cna cnc cnn cns csa csc csk csn css ka- kaa kac kak kan kas kca kcc kck kcn kcs kkc kkk kkn kks kn- kna knc knk knn ksa ksc ksk ksn kss naa nac nak nan nas nca ncc nck ncn ncs nka nkc nkk nkn nks nna nnc nnk nnn nns nsa nsc nsk nsn nss saa sac sak san sas sca scc sck scn scs sk- ska skc skk sks sna snc snk snn sns ss- ssa ssc ssk ssn sss