fff ffg ffi ffn ffs fgf fgg fgi fgn fgs fif fig fii fin fis fnf fng fni fnn fns fsf fsg fsi fsn fss gff gfi gfs ggg ggi ggn ggs gif gig gii gin gis gnf gni gnn gns gsf gsg gsi gsn gss i-f iff ifg ifi ifn ifs igf igg igi ign igs iif iii iin iis in- inf ing ini inn ins is- isf isg isi isn iss n-i nff nfi nfn nfs ngf ngg ngi ngn ngs nif nig nii nin nis nnf nng nni nnn nns nsf nsg nsi nsn nss sff sfg sfi sfn sfs sgf sgg sgi sgn sgs sif sig sii sin sis snf sng sni snn sns ss- ssf ssg ssi ssn sss