fff ffi ffk ffn ffr ffs fif fii fik fin fir fis fkf fki fkk fnf fni fnk fnn fnr fns frf fri frk frn frr frs fsf fsi fsk fsn fsr fss i-f iff ifi ifn ifr ifs iif iii iin iir iis ikf iki ikk ikr iks in- inf ini ink inn inr ins ir- irf iri irk irn irr irs is- isf isi isk isn isr iss kff kfi kfs kif kii kik kin kir kis kki kkk kkn kkr kks kn- knf kni knk knn knr krf kri krk krn krr krs ksf ksi ksk ksn ksr kss n-i nff nfi nfk nfn nfr nfs nif nii nik nin nir nis nkf nki nkk nkn nkr nks nnf nni nnk nnn nns nrf nri nrk nrn nrr nrs nsf nsi nsk nsn nsr nss rff rfi rfk rfn rfr rfs rif rii rik rin rir ris rkf rkk rks rni rnn rnr rns rrf rri rrk rrn rrr rrs rsf rsi rsk rsn rsr rss sff sfi sfk sfn sfr sfs sif sii sik sin sir sis sk- skf ski skk skr sks snf sni snk snn snr sns sr- srf sri srk srn srr srs ss- ssf ssi ssk ssn ssr sss