fff ffg ffi ffn ffo ffs fft fgf fgg fgi fgn fgs fgt fif fig fii fin fis fit fnf fng fni fnn fns fnt fof fog foi fon foo fos fot fsf fsg fsi fsn fso fss fst ftf ftg fti ftn fto fts ftt gff gfi gfo gfs gft ggg ggi ggn ggo ggs ggt gif gig gii gin gio gis git gnf gni gnn gno gns gnt gof gog goi gon goo gos got gsf gsg gsi gsn gso gss gst gtf gtg gti gtn gto gts gtt i-f iff ifg ifi ifn ifo ifs ift igf igg igi ign igo igs igt iif iii iin iio iis iit in- inf ing ini inn ino ins int io- iof iog ioi ion ioo ios iot is- isf isg isi isn iso iss ist itf itg iti itn ito its itt n-i nff nfi nfn nfo nfs nft ngf ngg ngi ngn ngo ngs ngt nif nig nii nin nio nis nit nnf nng nni nnn nno nns nnt no- nof nog noi non noo nos not nsf nsg nsi nsn nso nss nst ntf ntg nti ntn nto nts ntt o-i of- off ofg ofi ofn ofo ofs oft ogf ogg ogi ogn ogo ogs ogt oif oii oin oio ois oit on- onf ong oni onn ono ons ont oo- oof oog ooi oon ooo oos oot os- osf osg osi osn oso oss ost ot- otf otg oti otn oto ots ott sff sfg sfi sfn sfo sfs sft sgf sgg sgi sgn sgo sgs sgt sif sig sii sin sio sis sit snf sng sni snn sno sns snt sof sog soi son soo sos sot ss- ssf ssg ssi ssn sso sss sst stf stg sti stn sto sts stt tff tfg tfi tfn tfo tfs tft tgf tgg tgi tgn tgo tgs tgt tif tig tii tin tio tis tit tnf tng tni tnn tno tns tnt to- tof tog toi ton too tos tot tsf tsg tsi tsn tso tss tst ttf ttg tti ttn tto tts ttt