fff ffi ffk ffn ffo ffp fif fii fik fin fip fkf fki fkk fkp fnf fni fnk fnn fnp fof foi fok fon foo fop fpi fpk fpn fpo fpp i-f iff ifi ifn ifo ifp iif iii iin iio iip ikf iki ikk iko in- inf ini ink inn ino inp io- iof ioi ion ioo iop ipf ipi ipn ipo ipp kff kfi kfo kif kii kik kin kio kip kki kkk kkn kkp kn- knf kni knk knn kno knp kof koi kok kon koo kop kpf kpi kpk kpn kpo kpp n-i nff nfi nfk nfn nfo nfp nif nii nik nin nio nip nkf nki nkk nkn nko nkp nnf nni nnk nnn nno nnp no- nof noi nok non noo nop npf npi npn npo npp o-i of- off ofi ofn ofo ofp oif oii oik oin oio oip oki okk oko okp on- onf oni onk onn ono onp oo- oof ooi ook oon ooo oop op- opf opi opk opn opo opp p-p pff pfi pfk pfn pfo pfp pif pii pik pin pio pip pkf pki pkn pko pkp pn- pnf pni pnk pnn pno pnp pof poi pok pon poo pop ppf ppi ppk ppn ppo ppp