b-u bbb bbd bbn bbo bbt bbu bby bdb bdd bdo bdt bdu bdy bnb bnd bnn bno bnt bnu bob bod bon boo bot bou boy btb btd btn bto btt btu bty bub bud bun buo but buu buy by- byd byn byo byt byu dbb dbd dbn dbo dbt dbu dby ddb ddd ddn ddo ddt ddu ddy dnb dnd dnn dno dnt dny dob dod don doo dot dou doy dtb dtd dtn dto dtt dtu dty dub dud dun duo dut duy dy- dyb dyd dyn dyo dyu dyy nbb nbd nbn nbo nbt nbu ndb ndd ndn ndo ndt ndu ndy nnb nnn nno nnt nnu no- nob nod non noo not nou noy ntb ntd ntn nto ntt ntu nub nud nun nuo nut nuu nuy nyd nyn nyo nyt nyu nyy ob- obb obd obn obo obt obu oby odb odd odn odo odt odu on- onb ond onn ono ont onu ony oo- oob ood oon ooo oot ot- otb otd otn oto ott otu ou- oud oun ouo out oyd oyo tbb tbd tbn tbo tbt tbu tdb tdd tdn tdo tdt tdu tdy tnb tnd tnn tno tnt to- tob tod ton too tot tou toy ttb ttd ttn tto ttt ttu tty tub tud tun tuo tut tuu tuy tyd tyn tyo tyt ubb ubn ubo ubt ubu uby udb udd udn udo udt udu un- unb und unn uno unt unu uny uob uod uon uoo uot utb utd utn uto utt utu uty uun uut uuu uyo uyu yby ydn ydo ydt ydy ynd ynn ynu yny yob yod yon yoo yot you yoy ytd ytn yto ytt ytu yud yun yuo yut yuu yuy yyb yyt yyu yyy