fff ffi ffn ffp ffs ffy fif fii fin fip fis fnf fni fnn fnp fns fpi fpn fpp fps fpy fsf fsi fsn fsp fss fy- fyi fyn fyp i-f iff ifi ifn ifp ifs ify iif iii iin iip iis in- inf ini inn inp ins iny ipf ipi ipn ipp ips ipy is- isf isi isn isp iss isy iys iyy n-i nff nfi nfn nfp nfs nif nii nin nip nis nnf nni nnn nnp nns npf npi npn npp nps nsf nsi nsn nsp nss nsy nyf nyn nyp nys nyy p-p pff pfi pfn pfp pfs pfy pif pii pin pip pis pn- pnf pni pnn pnp pns pny ppf ppi ppn ppp pps ps- psf psi psn psp pss psy py- pyf pyn pys sff sfi sfn sfp sfs sif sii sin sip sis snf sni snn snp sns sny spf spi spn spp sps spy ss- ssf ssi ssn ssp sss sy- syi syn syp sys yff yfs yif yii yin yip yis ynn ynp yns yny ypf yps ysi ysp yss ysy yyf yys yyy