-ol fff ffg ffl ffo ffs fft fgf fgg fgl fgs fgt flf flg fll flo fls flt fof fog fol foo fos fot fsf fsg fsl fso fss fst ftf ftg ftl fto fts ftt gff gfl gfo gfs gft ggg ggo ggs ggt glf glg gll glo gls glt gof gog gol goo gos got gsf gsg gsl gso gss gst gtf gtg gtl gto gts gtt lff lfg lfl lfo lfs lft lgf lgg lgl lgo lgs lgt llf llg lll llo lls llt lof log lol loo los lot lsf lsg lsl lso lss lst ltf ltg ltl lto lts ltt of- off ofg ofl ofo ofs oft ogf ogg ogl ogo ogs ogt olf olg oll olo ols olt oo- oof oog ool ooo oos oot os- osf osg osl oso oss ost ot- otf otg otl oto ots ott sff sfg sfl sfo sfs sft sgf sgg sgl sgo sgs sgt slf slg sll slo sls slt sof sog sol soo sos sot ss- ssf ssg ssl sso sss sst stf stg stl sto sts stt tff tfg tfl tfo tfs tft tgf tgg tgl tgo tgs tgt tlf tlg tll tlo tls tlt to- tof tog tol too tos tot tsf tsg tsl tso tss tst ttf ttg ttl tto tts ttt