b-u bbb bbc bbn bbo bbu bcb bcc bcn bco bcu bnb bnc bnn bno bnu bob boc bon boo bou bub buc bun buo buu c-- cbb cbc cbn cbo cbu ccb ccc ccn cco ccu cn- cnb cnc cnn cno cnu co- cob coc con coo cou cub cuc cun cuo cuu nbb nbc nbn nbo nbu ncb ncc ncn nco ncu nnb nnc nnn nno nnu no- nob noc non noo nou nub nuc nun nuo nuu ob- obb obc obn obo obu oc- ocb occ ocn oco ocu on- onb onc onn ono onu oo- oob ooc oon ooo ou- ouc oun ouo ubb ubc ubn ubo ubu ucb ucc ucn uco ucu un- unb unc unn uno unu uob uoc uon uoo uuc uun uuu