b-u bbb bbc bbd bbn bbo bbt bbu bby bcb bcc bcd bcn bco bct bcu bcy bdb bdc bdd bdo bdt bdu bdy bnb bnc bnd bnn bno bnt bnu bob boc bod bon boo bot bou boy btb btc btd btn bto btt btu bty bub buc bud bun buo but buu buy by- byc byd byn byo byt byu c-- cbb cbc cbd cbn cbo cbt cbu cby ccb ccc ccd ccn cco cct ccu cdb cdc cdd cdn cdo cdt cdu cdy cn- cnb cnc cnd cnn cno cnt cnu cny co- cob coc cod con coo cot cou coy ctb ctc ctd ctn cto ctt ctu cty cub cuc cud cun cuo cut cuu cuy cyb cyc cyd cyn cyo cyt dbb dbc dbd dbn dbo dbt dbu dby dcb dcc dcd dcn dco dct dcu ddb ddc ddd ddn ddo ddt ddu ddy dnb dnc dnd dnn dno dnt dny dob doc dod don doo dot dou doy dtb dtc dtd dtn dto dtt dtu dty dub duc dud dun duo dut duy dy- dyb dyc dyd dyn dyo dyu dyy nbb nbc nbd nbn nbo nbt nbu ncb ncc ncd ncn nco nct ncu ndb ndc ndd ndn ndo ndt ndu ndy nnb nnc nnn nno nnt nnu no- nob noc nod non noo not nou noy ntb ntc ntd ntn nto ntt ntu nub nuc nud nun nuo nut nuu nuy nyc nyd nyn nyo nyt nyu nyy ob- obb obc obd obn obo obt obu oby oc- ocb occ ocd ocn oco oct ocu odb odc odd odn odo odt odu on- onb onc ond onn ono ont onu ony oo- oob ooc ood oon ooo oot ot- otb otc otd otn oto ott otu ou- ouc oud oun ouo out oyd oyo tbb tbc tbd tbn tbo tbt tbu tcb tcc tcd tcn tco tct tcu tdb tdc tdd tdn tdo tdt tdu tdy tnb tnc tnd tnn tno tnt to- tob toc tod ton too tot tou toy ttb ttc ttd ttn tto ttt ttu tty tub tuc tud tun tuo tut tuu tuy tyc tyd tyn tyo tyt ubb ubc ubn ubo ubt ubu uby ucb ucc ucd ucn uco uct ucu udb udc udd udn udo udt udu un- unb unc und unn uno unt unu uny uob uoc uod uon uoo uot utb utc utd utn uto utt utu uty uuc uun uut uuu uyc uyo uyu ybc yby ycc ycd yco ycu ycy ydn ydo ydt ydy ynd ynn ynu yny yob yoc yod yon yoo yot you yoy ytc ytd ytn yto ytt ytu yud yun yuo yut yuu yuy yyb yyc yyt yyu yyy