a-a aaa aak aan aao aas aka akk akn ako aks an- ana ank ann ano ans aoa aok aon aoo aos as- asa ask asn aso ass ka- kaa kak kan kao kas kkk kkn kks kn- kna knk knn kno koa kok kon koo kos ksa ksk ksn kso kss naa nak nan nao nas nka nkk nkn nko nks nna nnk nnn nno nns no- noa nok non noo nos nsa nsk nsn nso nss oaa oak oan oao oas oka okk oko oks on- ona onk onn ono ons oo- ooa ook oon ooo oos os- osa osk osn oso oss saa sak san sao sas sk- ska skk sko sks sna snk snn sno sns soa sok son soo sos ss- ssa ssk ssn sso sss