bbb bbf bbg bbi bbo bbt bbx bfb bff bfg bfi bfo bft bfx bgb bgf bgg bgi bgo bgt bgx bi- bib bif big bii bio bit bix bob bof bog boi boo bot box btb btf btg bti bto btt btx bxb bxi bxo bxx fbb fbf fbg fbi fbo fbt fbx fff ffg ffi ffo fft ffx fgb fgf fgg fgi fgt fib fif fig fii fit fix fob fof fog foi foo fot fox ftb ftf ftg fti fto ftt ftx fxg fxi fxt fxx gbf gbg gbi gbo gbt gbx gfb gff gfi gfo gft gfx ggb ggg ggi ggo ggt gib gif gig gii gio git gob gof gog goi goo got gox gtb gtf gtg gti gto gtt gtx gxf gxt i-f ibb ibf ibg ibi ibo ibt ibx ifb iff ifg ifi ifo ift ifx igb igf igg igi igo igt iib iif iii iio iit iix io- iob iof iog ioi ioo iot itb itf itg iti ito itt itx ixi o-i ob- obb obf obg obi obo obt obx of- ofb off ofg ofi ofo oft ofx ogf ogg ogi ogo ogt ogx oib oif oii oio oit oo- oob oof oog ooi ooo oot oox ot- otb otf otg oti oto ott ox- oxb oxf oxi oxo oxt oxx t-x tbb tbf tbg tbi tbo tbt tfb tff tfg tfi tfo tft tfx tgb tgf tgg tgi tgo tgt tib tif tig tii tio tit tix to- tob tof tog toi too tot tox ttb ttf ttg tti tto ttt ttx txf txi txt xbx xft xfx xgi xii xio xit xix xof xog xoi xoo xot xox xtf xti xtx xxi xxo xxx