kkk kkn kkr kks kn- knk knn kno knr kok kon koo kor kos krk krn kro krr krs ksk ksn kso ksr kss nkk nkn nko nkr nks nnk nnn nno nns no- nok non noo nor nos nrk nrn nro nrr nrs nsk nsn nso nsr nss okk oko okr oks on- onk onn ono onr ons oo- ook oon ooo oor oos or- ork orn oro orr ors os- osk osn oso osr oss rkk rko rks rnn rno rnr rns rok ron roo ror ros rrk rrn rrr rrs rsk rsn rso rsr rss sk- skk sko skr sks snk snn sno snr sns sok son soo sor sos sr- srk srn sro srr srs ss- ssk ssn sso ssr sss