bbb bbc bbe bbn bbo bbx bcb bcc bce bcn bco bcx be- beb bec bee ben beo bex bnb bnc bne bnn bno bnx bob boc boe bon boo box bxb bxn bxo bxx c-- cbb cbc cbe cbn cbo cbx ccb ccc cce ccn cco ccx ce- ceb cec cee cen ceo cex cn- cnb cnc cne cnn cno cnx co- cob coc coe con coo cox cxc cxo cxx ebb ebc ebe ebn ebo ebx ec- ecb ecc ece ecn eco ecx eeb eec eee een eeo eex en- enb enc ene enn eno eo- eob eoc eoe eon eoo ex- exc exe exo exx nbb nbc nbe nbn nbo nbx ncb ncc nce ncn nco ncx ne- neb nec nee nen neo nex nnb nnc nne nnn nno no- nob noc noe non noo nox nxc ob- obb obc obe obn obo obx oc- ocb occ ocn oco ocx oeb oec oee oen oeo oex on- onb onc one onn ono onx oo- oob ooc oon ooo oox ox- oxb oxc oxn oxo oxx xbc xbe xbx xcb xcx xee xen xex xnc xno xoc xon xoo xox xxo xxx