a-a aaa aak aan aar aas aka akk akn akr aks an- ana ank ann anr ans ar- ara ark arn arr ars as- asa ask asn asr ass ka- kaa kak kan kar kas kkk kkn kkr kks kn- kna knk knn knr kra krk krn krr krs ksa ksk ksn ksr kss naa nak nan nar nas nka nkk nkn nkr nks nna nnk nnn nns nra nrk nrn nrr nrs nsa nsk nsn nsr nss ra- raa rak ran rar ras rkk rks rna rnn rnr rns rra rrk rrn rrr rrs rsa rsk rsn rsr rss saa sak san sar sas sk- ska skk skr sks sna snk snn snr sns sr- sra srk srn srr srs ss- ssa ssk ssn ssr sss