bbb bbn bbo bbr bbs bby bnb bnn bno bnr bns bob bon boo bor bos boy brb brn bro brr brs bry bsb bsn bso bsr bss bsy by- byn byo byr bys nbb nbn nbo nbr nbs nnb nnn nno nns no- nob non noo nor nos noy nrb nrn nro nrr nrs nry nsb nsn nso nsr nss nsy nyn nyo nys nyy ob- obb obn obo obr obs oby on- onb onn ono onr ons ony oo- oob oon ooo oor oos or- orb orn oro orr ors ory os- osb osn oso osr oss oyo oys rbb rbn rbo rbr rbs rnb rnn rno rnr rns rny rob ron roo ror ros roy rrb rrn rrr rrs rsb rsn rso rsr rss ry- ryn ryo ryr rys ryy sbb sbn sbo sbr sbs sby snb snn sno snr sns sny sob son soo sor sos soy sr- srb srn sro srr srs sry ss- ssb ssn sso ssr sss sy- syb syn syr sys ybr ybs yby ynn yns yny yob yon yoo yor yos yoy yrn yro yrs ysb yso ysr yss ysy yyb yys yyy