a-a a-i aaa aaf aai aan aao aas af- afa aff afi afn afo afs ai- aia aif aii ain aio ais an- ana anf ani ann ano ans aoa aof aoi aon aoo aos as- asa asf asi asn aso ass faa faf fai fan fao fas ffa fff ffi ffn ffo ffs fia fif fii fin fis fna fnf fni fnn fns foa fof foi fon foo fos fsa fsf fsi fsn fso fss i-f ia- iaa iaf iai ian iao ias ifa iff ifi ifn ifo ifs iia iif iii iin iio iis in- ina inf ini inn ino ins io- ioa iof ioi ion ioo ios is- isa isf isi isn iso iss n-i naa naf nai nan nao nas nfa nff nfi nfn nfo nfs nia nif nii nin nio nis nna nnf nni nnn nno nns no- noa nof noi non noo nos nsa nsf nsi nsn nso nss o-i oaa oaf oai oan oao oas of- ofa off ofi ofn ofo ofs oia oif oii oin oio ois on- ona onf oni onn ono ons oo- ooa oof ooi oon ooo oos os- osa osf osi osn oso oss saa saf sai san sao sas sfa sff sfi sfn sfo sfs sia sif sii sin sio sis sna snf sni snn sno sns soa sof soi son soo sos ss- ssa ssf ssi ssn sso sss