fff ffi ffn ffr ffs fft fif fii fin fir fis fit fnf fni fnn fnr fns fnt frf fri frn frr frs frt fsf fsi fsn fsr fss fst ftf fti ftn ftr fts ftt i-f iff ifi ifn ifr ifs ift iif iii iin iir iis iit in- inf ini inn inr ins int ir- irf iri irn irr irs irt is- isf isi isn isr iss ist itf iti itn its itt n-i nff nfi nfn nfr nfs nft nif nii nin nir nis nit nnf nni nnn nns nnt nrf nri nrn nrr nrs nrt nsf nsi nsn nsr nss nst ntf nti ntn ntr nts ntt rff rfi rfn rfr rfs rft rif rii rin rir ris rit rni rnn rnr rns rnt rrf rri rrn rrr rrs rrt rsf rsi rsn rsr rss rst rtf rti rtn rtr rts rtt sff sfi sfn sfr sfs sft sif sii sin sir sis sit snf sni snn snr sns snt sr- srf sri srn srr srs srt ss- ssf ssi ssn ssr sss sst stf sti stn str sts stt tff tfi tfn tfr tfs tft tif tii tin tir tis tit tnf tni tnn tnr tns tnt trf tri trn trr trs trt tsf tsi tsn tsr tss tst ttf tti ttn ttr tts ttt