bbb bbn bbo bbs bby bnb bnn bno bns bob bon boo bos boy bsb bsn bso bss bsy by- byn byo bys nbb nbn nbo nbs nnb nnn nno nns no- nob non noo nos noy nsb nsn nso nss nsy nyn nyo nys nyy ob- obb obn obo obs oby on- onb onn ono ons ony oo- oob oon ooo oos os- osb osn oso oss oyo oys sbb sbn sbo sbs sby snb snn sno sns sny sob son soo sos soy ss- ssb ssn sso sss sy- syb syn sys ybs yby ynn yns yny yob yon yoo yos yoy ysb yso yss ysy yyb yys yyy