bbb bbn bbo bbr bby bnb bnn bno bnr bnz bob bon boo bor boy boz brb brn bro brr bry brz by- byn byo byr byz bzn bzo bzr bzz nbb nbn nbo nbr nnb nnn nno nnz no- nob non noo nor noy noz nrb nrn nro nrr nry nrz nyn nyo nyy nzb nzo nzz ob- obb obn obo obr oby on- onb onn ono onr ony oo- oob oon ooo oor or- orb orn oro orr ory orz oyo ozo ozz rbb rbn rbo rbr rnb rnn rno rnr rny rnz rob ron roo ror roy roz rrb rrn rrr ry- ryn ryo ryr ryy ryz rzb rzo rzy ybr yby ybz ynn yny yob yon yoo yor yoy yrn yro yyb yyy yyz yzb yzr yzy zbb zbr zby znn zno zo- zob zon zoo zor zro zzr zzy zzz