fff ffi ffn ffr fft ffz fif fii fin fir fit fiz fnf fni fnn fnr fnt fnz frf fri frn frr frt ftf fti ftn ftr ftt ftz i-f iff ifi ifn ifr ift ifz iif iii iin iir iit in- inf ini inn inr int ir- irf iri irn irr irt itf iti itn itt itz izi izz n-i nff nfi nfn nfr nft nif nii nin nir nit niz nnf nni nnn nnt nnz nrf nri nrn nrr nrt nrz ntf nti ntn ntr ntt ntz nzf nzi nzz rff rfi rfn rfr rft rfz rif rii rin rir rit riz rni rnn rnr rnt rnz rrf rri rrn rrr rrt rtf rti rtn rtr rtt rtz tff tfi tfn tfr tft tif tii tin tir tit tiz tnf tni tnn tnr tnt tnz trf tri trn trr trt trz ttf tti ttn ttr ttt tzf zfn zfr zif zin zir zit ziz znn ztr zzr zzt zzz