a-a a-i aaa aaf aai aan aao af- afa aff afi afn afo ai- aia aif aii ain aio an- ana anf ani ann ano aoa aof aoi aon aoo faa faf fai fan fao ffa fff ffi ffn ffo fia fif fii fin fna fnf fni fnn foa fof foi fon foo i-f ia- iaa iaf iai ian iao ifa iff ifi ifn ifo iia iif iii iin iio in- ina inf ini inn ino io- ioa iof ioi ion ioo n-i naa naf nai nan nao nfa nff nfi nfn nfo nia nif nii nin nio nna nnf nni nnn nno no- noa nof noi non noo o-i oaa oaf oai oan oao of- ofa off ofi ofn ofo oia oif oii oin oio on- ona onf oni onn ono oo- ooa oof ooi oon ooo