bbb bbg bbi bbo bbt bgb bgg bgi bgo bgt bi- bib big bii bio bit bob bog boi boo bot btb btg bti bto btt gbg gbi gbo gbt ggb ggg ggi ggo ggt gib gig gii gio git gob gog goi goo got gtb gtg gti gto gtt ibb ibg ibi ibo ibt igb igg igi igo igt iib iii iio iit io- iob iog ioi ioo iot itb itg iti ito itt o-i ob- obb obg obi obo obt ogg ogi ogo ogt oib oii oio oit oo- oob oog ooi ooo oot ot- otb otg oti oto ott tbb tbg tbi tbo tbt tgb tgg tgi tgo tgt tib tig tii tio tit to- tob tog toi too tot ttb ttg tti tto ttt