bbb bbe bbg bbo bbx be- beb bee beg beo bex bgb bge bgg bgo bgx bob boe bog boo box bxb bxo bxx ebb ebe ebg ebo ebx eeb eee eeg eeo eex egb ege egg ego egx eo- eob eoe eog eoo ex- exe exo exx gbe gbg gbo gbx ge- geb gee geg geo gex ggb ggg ggo gob goe gog goo gox ob- obb obe obg obo obx oeb oee oeg oeo oex oge ogg ogo ogx oo- oob oog ooo oox ox- oxb oxo oxx xbe xbx xee xeg xex xge xog xoo xox xxo xxx