fff ffg ffi ffo ffs fft fgf fgg fgi fgs fgt fif fig fii fis fit fof fog foi foo fos fot fsf fsg fsi fso fss fst ftf ftg fti fto fts ftt gff gfi gfo gfs gft ggg ggi ggo ggs ggt gif gig gii gio gis git gof gog goi goo gos got gsf gsg gsi gso gss gst gtf gtg gti gto gts gtt i-f iff ifg ifi ifo ifs ift igf igg igi igo igs igt iif iii iio iis iit io- iof iog ioi ioo ios iot is- isf isg isi iso iss ist itf itg iti ito its itt o-i of- off ofg ofi ofo ofs oft ogf ogg ogi ogo ogs ogt oif oii oio ois oit oo- oof oog ooi ooo oos oot os- osf osg osi oso oss ost ot- otf otg oti oto ots ott sff sfg sfi sfo sfs sft sgf sgg sgi sgo sgs sgt sif sig sii sio sis sit sof sog soi soo sos sot ss- ssf ssg ssi sso sss sst stf stg sti sto sts stt tff tfg tfi tfo tfs tft tgf tgg tgi tgo tgs tgt tif tig tii tio tis tit to- tof tog toi too tos tot tsf tsg tsi tso tss tst ttf ttg tti tto tts ttt