-ol bbb bbf bbg bbi bbl bbo bbs bbt bfb bff bfg bfi bfl bfo bfs bft bgb bgf bgg bgi bgl bgo bgs bgt bi- bib bif big bii bil bio bis bit blb blf blg bli bll blo bls blt bob bof bog boi bol boo bos bot bsb bsf bsg bsi bsl bso bss bst btb btf btg bti btl bto bts btt fbb fbf fbg fbi fbl fbo fbs fbt fff ffg ffi ffl ffo ffs fft fgb fgf fgg fgi fgl fgs fgt fib fif fig fii fil fis fit flb flf flg fli fll flo fls flt fob fof fog foi fol foo fos fot fsb fsf fsg fsi fsl fso fss fst ftb ftf ftg fti ftl fto fts ftt gbf gbg gbi gbl gbo gbs gbt gfb gff gfi gfl gfo gfs gft ggb ggg ggi ggo ggs ggt gib gif gig gii gil gio gis git glb glf glg gli gll glo gls glt gob gof gog goi gol goo gos got gsb gsf gsg gsi gsl gso gss gst gtb gtf gtg gti gtl gto gts gtt i-f ibb ibf ibg ibi ibl ibo ibs ibt ifb iff ifg ifi ifl ifo ifs ift igb igf igg igi igl igo igs igt iib iif iii iil iio iis iit il- ilb ilf ilg ili ill ilo ils ilt io- iob iof iog ioi iol ioo ios iot is- isb isf isg isi isl iso iss ist itb itf itg iti itl ito its itt lbb lbf lbg lbi lbl lbo lbs lbt lfb lff lfg lfi lfl lfo lfs lft lgb lgf lgg lgi lgl lgo lgs lgt lib lif lig lii lil lio lis lit llb llf llg lli lll llo lls llt lob lof log loi lol loo los lot lsb lsf lsg lsi lsl lso lss lst ltb ltf ltg lti ltl lto lts ltt o-i ob- obb obf obg obi obl obo obs obt of- ofb off ofg ofi ofl ofo ofs oft ogf ogg ogi ogl ogo ogs ogt oib oif oii oil oio ois oit olb olf olg oli oll olo ols olt oo- oob oof oog ooi ool ooo oos oot os- osb osf osg osi osl oso oss ost ot- otb otf otg oti otl oto ots ott sbb sbf sbg sbi sbl sbo sbs sbt sfb sff sfg sfi sfl sfo sfs sft sgb sgf sgg sgi sgl sgo sgs sgt sib sif sig sii sil sio sis sit slb slf slg sli sll slo sls slt sob sof sog soi sol soo sos sot ss- ssb ssf ssg ssi ssl sso sss sst stb stf stg sti stl sto sts stt tbb tbf tbg tbi tbl tbo tbs tbt tfb tff tfg tfi tfl tfo tfs tft tgb tgf tgg tgi tgl tgo tgs tgt tib tif tig tii til tio tis tit tlf tlg tli tll tlo tls tlt to- tob tof tog toi tol too tos tot tsb tsf tsg tsi tsl tso tss tst ttb ttf ttg tti ttl tto tts ttt