bbb bbd bbn bbo bbt bby bdb bdd bdo bdt bdy bnb bnd bnn bno bnt bob bod bon boo bot boy btb btd btn bto btt bty by- byd byn byo byt dbb dbd dbn dbo dbt dby ddb ddd ddn ddo ddt ddy dnb dnd dnn dno dnt dny dob dod don doo dot doy dtb dtd dtn dto dtt dty dy- dyb dyd dyn dyo dyy nbb nbd nbn nbo nbt ndb ndd ndn ndo ndt ndy nnb nnn nno nnt no- nob nod non noo not noy ntb ntd ntn nto ntt nyd nyn nyo nyt nyy ob- obb obd obn obo obt oby odb odd odn odo odt on- onb ond onn ono ont ony oo- oob ood oon ooo oot ot- otb otd otn oto ott oyd oyo tbb tbd tbn tbo tbt tdb tdd tdn tdo tdt tdy tnb tnd tnn tno tnt to- tob tod ton too tot toy ttb ttd ttn tto ttt tty tyd tyn tyo tyt yby ydn ydo ydt ydy ynd ynn yny yob yod yon yoo yot yoy ytd ytn yto ytt yyb yyt yyy