iii iin iio iip iis iki ikk iko iks in- ini ink inn ino inp ins io- ioi ion ioo iop ios ipi ipn ipo ipp ips is- isi isk isn iso isp iss kii kik kin kio kip kis kki kkk kkn kkp kks kn- kni knk knn kno knp koi kok kon koo kop kos kpi kpk kpn kpo kpp kps ksi ksk ksn kso ksp kss n-i nii nik nin nio nip nis nki nkk nkn nko nkp nks nni nnk nnn nno nnp nns no- noi nok non noo nop nos npi npn npo npp nps nsi nsk nsn nso nsp nss o-i oii oik oin oio oip ois oki okk oko okp oks on- oni onk onn ono onp ons oo- ooi ook oon ooo oop oos op- opi opk opn opo opp ops os- osi osk osn oso osp oss p-p pii pik pin pio pip pis pki pkn pko pkp pks pn- pni pnk pnn pno pnp pns poi pok pon poo pop pos ppi ppk ppn ppo ppp pps ps- psi psk psn pso psp pss sii sik sin sio sip sis sk- ski skk sko skp sks sni snk snn sno snp sns soi sok son soo sop sos spi spk spn spo spp sps ss- ssi ssk ssn sso ssp sss