bbb bbf bbg bbi bbl bbt bfb bff bfg bfi bfl bft bgb bgf bgg bgi bgl bgt bi- bib bif big bii bil bit blb blf blg bli bll blt btb btf btg bti btl btt fbb fbf fbg fbi fbl fbt fff ffg ffi ffl fft fgb fgf fgg fgi fgl fgt fib fif fig fii fil fit flb flf flg fli fll flt ftb ftf ftg fti ftl ftt gbf gbg gbi gbl gbt gfb gff gfi gfl gft ggb ggg ggi ggt gib gif gig gii gil git glb glf glg gli gll glt gtb gtf gtg gti gtl gtt i-f ibb ibf ibg ibi ibl ibt ifb iff ifg ifi ifl ift igb igf igg igi igl igt iib iif iii iil iit il- ilb ilf ilg ili ill ilt itb itf itg iti itl itt lbb lbf lbg lbi lbl lbt lfb lff lfg lfi lfl lft lgb lgf lgg lgi lgl lgt lib lif lig lii lil lit llb llf llg lli lll llt ltb ltf ltg lti ltl ltt tbb tbf tbg tbi tbl tbt tfb tff tfg tfi tfl tft tgb tgf tgg tgi tgl tgt tib tif tig tii til tit tlf tlg tli tll tlt ttb ttf ttg tti ttl ttt