bbb bbe bbg bbi bbo bbx be- beb bee beg bei beo bex bgb bge bgg bgi bgo bgx bi- bib bie big bii bio bix bob boe bog boi boo box bxb bxi bxo bxx ebb ebe ebg ebi ebo ebx eeb eee eeg eeo eex egb ege egg egi ego egx eib eie eig eii eio eix eo- eob eoe eog eoi eoo ex- exe exi exo exx gbe gbg gbi gbo gbx ge- geb gee geg gei geo gex ggb ggg ggi ggo gib gie gig gii gio gob goe gog goi goo gox ibb ibe ibg ibi ibo ibx ie- iee ieg iei iex igb ige igg igi igo iib iie iii iio iix io- iob ioe iog ioi ioo ixe ixi o-i ob- obb obe obg obi obo obx oeb oee oeg oei oeo oex oge ogg ogi ogo ogx oib oie oii oio oo- oob oog ooi ooo oox ox- oxb oxi oxo oxx xbe xbx xee xeg xex xge xgi xie xii xio xix xog xoi xoo xox xxi xxo xxx