a-a a-i aaa aaf aag aai aar aas af- afa aff afg afi afr afs ag- aga agf agg agi agr ags ai- aia aif aig aii air ais ar- ara arf arg ari arr ars as- asa asf asg asi asr ass faa faf fag fai far fas ffa fff ffg ffi ffr ffs fga fgf fgg fgi fgr fgs fia fif fig fii fir fis fra frf frg fri frr frs fsa fsf fsg fsi fsr fss gaa gaf gag gai gar gas gfa gff gfi gfr gfs gga ggg ggi ggr ggs gia gif gig gii gir gis gra grf grg gri grr grs gsa gsf gsg gsi gsr gss i-f ia- iaa iaf iag iai iar ias ifa iff ifg ifi ifr ifs iga igf igg igi igr igs iia iif iii iir iis ir- ira irf irg iri irr irs is- isa isf isg isi isr iss ra- raa raf rag rai rar ras rfa rff rfg rfi rfr rfs rga rgf rgg rgi rgr rgs ria rif rig rii rir ris rra rrf rrg rri rrr rrs rsa rsf rsg rsi rsr rss saa saf sag sai sar sas sfa sff sfg sfi sfr sfs sga sgf sgg sgi sgr sgs sia sif sig sii sir sis sr- sra srf srg sri srr srs ss- ssa ssf ssg ssi ssr sss