b-u bbb bbc bbn bbo bbt bbu bcb bcc bcn bco bct bcu bnb bnc bnn bno bnt bnu bob boc bon boo bot bou btb btc btn bto btt btu bub buc bun buo but buu c-- cbb cbc cbn cbo cbt cbu ccb ccc ccn cco cct ccu cn- cnb cnc cnn cno cnt cnu co- cob coc con coo cot cou ctb ctc ctn cto ctt ctu cub cuc cun cuo cut cuu nbb nbc nbn nbo nbt nbu ncb ncc ncn nco nct ncu nnb nnc nnn nno nnt nnu no- nob noc non noo not nou ntb ntc ntn nto ntt ntu nub nuc nun nuo nut nuu ob- obb obc obn obo obt obu oc- ocb occ ocn oco oct ocu on- onb onc onn ono ont onu oo- oob ooc oon ooo oot ot- otb otc otn oto ott otu ou- ouc oun ouo out tbb tbc tbn tbo tbt tbu tcb tcc tcn tco tct tcu tnb tnc tnn tno tnt to- tob toc ton too tot tou ttb ttc ttn tto ttt ttu tub tuc tun tuo tut tuu ubb ubc ubn ubo ubt ubu ucb ucc ucn uco uct ucu un- unb unc unn uno unt unu uob uoc uon uoo uot utb utc utn uto utt utu uuc uun uut uuu