a-a a-i aaa aaf aag aai aao aar aas af- afa aff afg afi afo afr afs ag- aga agf agg agi ago agr ags ai- aia aif aig aii aio air ais aoa aof aog aoi aoo aor aos ar- ara arf arg ari aro arr ars as- asa asf asg asi aso asr ass faa faf fag fai fao far fas ffa fff ffg ffi ffo ffr ffs fga fgf fgg fgi fgr fgs fia fif fig fii fir fis foa fof fog foi foo for fos fra frf frg fri fro frr frs fsa fsf fsg fsi fso fsr fss gaa gaf gag gai gao gar gas gfa gff gfi gfo gfr gfs gga ggg ggi ggo ggr ggs gia gif gig gii gio gir gis goa gof gog goi goo gor gos gra grf grg gri gro grr grs gsa gsf gsg gsi gso gsr gss i-f ia- iaa iaf iag iai iao iar ias ifa iff ifg ifi ifo ifr ifs iga igf igg igi igo igr igs iia iif iii iio iir iis io- ioa iof iog ioi ioo ior ios ir- ira irf irg iri iro irr irs is- isa isf isg isi iso isr iss o-i oaa oaf oag oai oao oar oas of- ofa off ofg ofi ofo ofr ofs oga ogf ogg ogi ogo ogs oia oif oii oio oir ois oo- ooa oof oog ooi ooo oor oos or- ora orf org ori oro orr ors os- osa osf osg osi oso osr oss ra- raa raf rag rai rao rar ras rfa rff rfg rfi rfo rfr rfs rga rgf rgg rgi rgo rgr rgs ria rif rig rii rio rir ris roa rof rog roi roo ror ros rra rrf rrg rri rrr rrs rsa rsf rsg rsi rso rsr rss saa saf sag sai sao sar sas sfa sff sfg sfi sfo sfr sfs sga sgf sgg sgi sgo sgr sgs sia sif sig sii sio sir sis soa sof sog soi soo sor sos sr- sra srf srg sri sro srr srs ss- ssa ssf ssg ssi sso ssr sss