a-a a-t aaa aaf aag aar aas aat af- afa aff afg afr afs aft ag- aga agf agg agr ags agt ar- ara arf arg arr ars art as- asa asf asg asr ass ast at- ata atf atg atr ats att faa faf fag far fas fat ffa fff ffg ffr ffs fft fga fgf fgg fgr fgs fgt fra frf frg frr frs frt fsa fsf fsg fsr fss fst fta ftf ftg ftr fts ftt gaa gaf gag gar gas gat gfa gff gfr gfs gft gga ggg ggr ggs ggt gra grf grg grr grs grt gsa gsf gsg gsr gss gst gta gtf gtg gtr gts gtt ra- raa raf rag rar ras rat rfa rff rfg rfr rfs rft rga rgf rgg rgr rgs rgt rra rrf rrg rrr rrs rrt rsa rsf rsg rsr rss rst rta rtf rtg rtr rts rtt saa saf sag sar sas sat sfa sff sfg sfr sfs sft sga sgf sgg sgr sgs sgt sr- sra srf srg srr srs srt ss- ssa ssf ssg ssr sss sst sta stf stg str sts stt taa taf tag tar tas tat tfa tff tfg tfr tfs tft tga tgf tgg tgr tgs tgt tra trf trg trr trs trt tsa tsf tsg tsr tss tst tta ttf ttg ttr tts ttt