fff ffi ffn ffo ffv fif fii fin fnf fni fnn fnv fof foi fon foo i-f i-v iff ifi ifn ifo iif iii iin iio in- inf ini inn ino inv io- iof ioi ion ioo iov ivf ivi ivo ivv n-i nff nfi nfn nfo nfv nif nii nin nio niv nnf nni nnn nno nnv no- nof noi non noo nov nvi nvn nvv o-i of- off ofi ofn ofo ofv oif oii oin oio oiv on- onf oni onn ono oo- oof ooi oon ooo oov ov- ovf ovi ovo ovv vff vfi vfn vfv vi- vif vii vin vio viv vn- vnf vni vno vnv vof voi von voo vov vvi vvo vvv