fff ffi ffn ffo ffs ffv fif fii fin fis fnf fni fnn fns fnv fof foi fon foo fos fsf fsi fsn fso fss fsv i-f i-v iff ifi ifn ifo ifs iif iii iin iio iis in- inf ini inn ino ins inv io- iof ioi ion ioo ios iov is- isf isi isn iso iss isv ivf ivi ivo ivs ivv n-i nff nfi nfn nfo nfs nfv nif nii nin nio nis niv nnf nni nnn nno nns nnv no- nof noi non noo nos nov nsf nsi nsn nso nss nsv nvi nvn nvv o-i of- off ofi ofn ofo ofs ofv oif oii oin oio ois oiv on- onf oni onn ono ons oo- oof ooi oon ooo oos oov os- osf osi osn oso oss osv ov- ovf ovi ovo ovs ovv sff sfi sfn sfo sfs sfv sif sii sin sio sis siv snf sni snn sno sns snv sof soi son soo sos sov ss- ssf ssi ssn sso sss ssv svf svi svn svo svs svv vff vfi vfn vfs vfv vi- vif vii vin vio vis viv vn- vnf vni vno vns vnv vof voi von voo vos vov vsf vsi vsn vso vss vsv vvi vvo vvs vvv