bbb bbe bbg bbk bbo be- beb bee beg bek beo bgb bge bgg bgk bgo bkb bke bkg bkk bko bob boe bog bok boo ebb ebe ebg ebk ebo eeb eee eeg eek eeo egb ege egg ego ekb eke ekg eko eo- eob eoe eog eok eoo gbe gbg gbk gbo ge- geb gee geg gek geo ggb ggg ggo gkb gko gob goe gog gok goo kbb kbe kbk kbo ke- keb kee keg kek keo kgb kgo kkb kke kkk kob koe kog kok koo ob- obb obe obg obk obo oeb oee oeg oeo oge ogg ogo okb oke okg okk oko oo- oob oog ook ooo