a-a a-i aaa aaf aag aai aao aas af- afa aff afg afi afo afs ag- aga agf agg agi ago ags ai- aia aif aig aii aio ais aoa aof aog aoi aoo aos as- asa asf asg asi aso ass faa faf fag fai fao fas ffa fff ffg ffi ffo ffs fga fgf fgg fgi fgs fia fif fig fii fis foa fof fog foi foo fos fsa fsf fsg fsi fso fss gaa gaf gag gai gao gas gfa gff gfi gfo gfs gga ggg ggi ggo ggs gia gif gig gii gio gis goa gof gog goi goo gos gsa gsf gsg gsi gso gss i-f ia- iaa iaf iag iai iao ias ifa iff ifg ifi ifo ifs iga igf igg igi igo igs iia iif iii iio iis io- ioa iof iog ioi ioo ios is- isa isf isg isi iso iss o-i oaa oaf oag oai oao oas of- ofa off ofg ofi ofo ofs oga ogf ogg ogi ogo ogs oia oif oii oio ois oo- ooa oof oog ooi ooo oos os- osa osf osg osi oso oss saa saf sag sai sao sas sfa sff sfg sfi sfo sfs sga sgf sgg sgi sgo sgs sia sif sig sii sio sis soa sof sog soi soo sos ss- ssa ssf ssg ssi sso sss