b-u bbb bbe bbn bbo bbu bbx be- beb bee ben beo beu bex bnb bne bnn bno bnu bnx bob boe bon boo bou box bub bue bun buo buu bux bxb bxn bxo bxx ebb ebe ebn ebo ebu ebx eeb eee een eeo eex en- enb ene enn eno enu eo- eob eoe eon eoo eou eu- eub eue eun eux ex- exe exo exu exx nbb nbe nbn nbo nbu nbx ne- neb nee nen neo neu nex nnb nne nnn nno nnu no- nob noe non noo nou nox nub nue nun nuo nuu nux ob- obb obe obn obo obu obx oeb oee oen oeo oex on- onb one onn ono onu onx oo- oob oon ooo oox ou- oue oun ouo ox- oxb oxn oxo oxx ubb ube ubn ubo ubu ubx ueb uee uen un- unb une unn uno unu unx uob uoe uon uoo uox uue uun uuu uxb uxo uxu xbe xbx xee xen xeu xex xno xnu xon xoo xox xue xun xxo xxx