bbb bbe bbn bbo bbx be- beb bee ben beo bex bnb bne bnn bno bnx bob boe bon boo box bxb bxn bxo bxx ebb ebe ebn ebo ebx eeb eee een eeo eex en- enb ene enn eno eo- eob eoe eon eoo ex- exe exo exx nbb nbe nbn nbo nbx ne- neb nee nen neo nex nnb nne nnn nno no- nob noe non noo nox ob- obb obe obn obo obx oeb oee oen oeo oex on- onb one onn ono onx oo- oob oon ooo oox ox- oxb oxn oxo oxx xbe xbx xee xen xex xno xon xoo xox xxo xxx