fff ffg ffi ffo ffr ffs fft fgf fgg fgi fgr fgs fgt fif fig fii fir fis fit fof fog foi foo for fos fot frf frg fri fro frr frs frt fsf fsg fsi fso fsr fss fst ftf ftg fti fto ftr fts ftt gff gfi gfo gfr gfs gft ggg ggi ggo ggr ggs ggt gif gig gii gio gir gis git gof gog goi goo gor gos got grf grg gri gro grr grs grt gsf gsg gsi gso gsr gss gst gtf gtg gti gto gtr gts gtt i-f iff ifg ifi ifo ifr ifs ift igf igg igi igo igr igs igt iif iii iio iir iis iit io- iof iog ioi ioo ior ios iot ir- irf irg iri iro irr irs irt is- isf isg isi iso isr iss ist itf itg iti ito its itt o-i of- off ofg ofi ofo ofr ofs oft ogf ogg ogi ogo ogs ogt oif oii oio oir ois oit oo- oof oog ooi ooo oor oos oot or- orf org ori oro orr ors ort os- osf osg osi oso osr oss ost ot- otf otg oti oto otr ots ott rff rfg rfi rfo rfr rfs rft rgf rgg rgi rgo rgr rgs rgt rif rig rii rio rir ris rit rof rog roi roo ror ros rot rrf rrg rri rrr rrs rrt rsf rsg rsi rso rsr rss rst rtf rtg rti rto rtr rts rtt sff sfg sfi sfo sfr sfs sft sgf sgg sgi sgo sgr sgs sgt sif sig sii sio sir sis sit sof sog soi soo sor sos sot sr- srf srg sri sro srr srs srt ss- ssf ssg ssi sso ssr sss sst stf stg sti sto str sts stt tff tfg tfi tfo tfr tfs tft tgf tgg tgi tgo tgr tgs tgt tif tig tii tio tir tis tit to- tof tog toi too tor tos tot trf trg tri tro trr trs trt tsf tsg tsi tso tsr tss tst ttf ttg tti tto ttr tts ttt