b-u bbb bbc bbe bbk bbn bbo bbt bbu bcb bcc bce bck bcn bco bct bcu be- beb bec bee bek ben beo bet beu bkb bkc bke bkk bkn bko bkt bnb bnc bne bnk bnn bno bnt bnu bob boc boe bok bon boo bot bou btb btc bte btk btn bto btt btu bub buc bue buk bun buo but buu c-- cbb cbc cbe cbk cbn cbo cbt cbu ccb ccc cce cck ccn cco cct ccu ce- ceb cec cee cek cen ceo cet ceu ckb ckc cko ckt cn- cnb cnc cne cnn cno cnt cnu co- cob coc coe cok con coo cot cou ctb ctc cte ctk ctn cto ctt ctu cub cuc cue cuk cun cuo cut cuu ebb ebc ebe ebk ebn ebo ebt ebu ec- ecb ecc ece eck ecn eco ect ecu eeb eec eee eek een eeo eet ekb ekc eke eko ekt eku en- enb enc ene enk enn eno ent enu eo- eob eoc eoe eok eon eoo eot eou etb etc ete etk etn eto ett etu eu- eub euc eue eun eut k-t kbb kbc kbe kbk kbn kbo kbu kcb kcc kce kck kcn kct kcu ke- keb kec kee kek ken keo ket kkb kkc kke kkk kkn kkt kku kn- knc kne knk knn kno knt knu kob koc koe kok kon koo kot kou ktb ktc kte ktk ktn kto ktt ktu kub kuc kue kuk kun kut kuu nbb nbc nbe nbk nbn nbo nbt nbu ncb ncc nce nck ncn nco nct ncu ne- neb nec nee nek nen neo net neu nkc nke nkk nkn nko nkt nku nnb nnc nne nnk nnn nno nnt nnu no- nob noc noe nok non noo not nou ntb ntc nte ntk ntn nto ntt ntu nub nuc nue nuk nun nuo nut nuu ob- obb obc obe obk obn obo obt obu oc- ocb occ ock ocn oco oct ocu oeb oec oee oen oeo oet okb okc oke okk oko oku on- onb onc one onk onn ono ont onu oo- oob ooc ook oon ooo oot ot- otb otc ote otk otn oto ott otu ou- ouc oue ouk oun ouo out tbb tbc tbe tbk tbn tbo tbt tbu tcb tcc tce tck tcn tco tct tcu te- teb tec tee tek ten teo tet teu tkb tkc tke tkk tko tkt tnb tnc tne tnk tnn tno tnt to- tob toc toe tok ton too tot tou ttb ttc tte ttk ttn tto ttt ttu tub tuc tue tuk tun tuo tut tuu ubb ubc ube ubk ubn ubo ubt ubu ucb ucc uce uck ucn uco uct ucu ueb uec uee uen uet ukb ukc uke ukk ukn uku un- unb unc une unk unn uno unt unu uob uoc uoe uok uon uoo uot utb utc ute utk utn uto utt utu uuc uue uun uut uuu