bbb bbf bbg bbi bbo bbt bfb bff bfg bfi bfo bft bgb bgf bgg bgi bgo bgt bi- bib bif big bii bio bit bob bof bog boi boo bot btb btf btg bti bto btt fbb fbf fbg fbi fbo fbt fff ffg ffi ffo fft fgb fgf fgg fgi fgt fib fif fig fii fit fob fof fog foi foo fot ftb ftf ftg fti fto ftt gbf gbg gbi gbo gbt gfb gff gfi gfo gft ggb ggg ggi ggo ggt gib gif gig gii gio git gob gof gog goi goo got gtb gtf gtg gti gto gtt i-f ibb ibf ibg ibi ibo ibt ifb iff ifg ifi ifo ift igb igf igg igi igo igt iib iif iii iio iit io- iob iof iog ioi ioo iot itb itf itg iti ito itt o-i ob- obb obf obg obi obo obt of- ofb off ofg ofi ofo oft ogf ogg ogi ogo ogt oib oif oii oio oit oo- oob oof oog ooi ooo oot ot- otb otf otg oti oto ott tbb tbf tbg tbi tbo tbt tfb tff tfg tfi tfo tft tgb tgf tgg tgi tgo tgt tib tif tig tii tio tit to- tob tof tog toi too tot ttb ttf ttg tti tto ttt