b-p bbb bbn bbo bbp bbr bbs bby bnb bnn bno bnp bnr bns bob bon boo bop bor bos boy bpb bpn bpo bpp bpr bps bpy brb brn bro brp brr brs bry bsb bsn bso bsp bsr bss bsy by- byn byo byp byr bys nbb nbn nbo nbp nbr nbs nnb nnn nno nnp nns no- nob non noo nop nor nos noy npb npn npo npp npr nps nrb nrn nro nrp nrr nrs nry nsb nsn nso nsp nsr nss nsy nyn nyo nyp nys nyy ob- obb obn obo obp obr obs oby on- onb onn ono onp onr ons ony oo- oob oon ooo oop oor oos op- opb opn opo opp opr ops opy or- orb orn oro orp orr ors ory os- osb osn oso osp osr oss oyo oys p-p pbb pbn pbo pbp pbr pbs pby pn- pnb pnn pno pnp pnr pns pny pob pon poo pop por pos poy ppb ppn ppo ppp ppr pps prb prn pro prp prr prs pry ps- psb psn pso psp psr pss psy py- pyb pyn pyo pyr pys rbb rbn rbo rbp rbr rbs rnb rnn rno rnp rnr rns rny rob ron roo rop ror ros roy rpb rpn rpo rpp rpr rps rrb rrn rrp rrr rrs rsb rsn rso rsp rsr rss ry- ryn ryo ryr rys ryy sbb sbn sbo sbp sbr sbs sby snb snn sno snp snr sns sny sob son soo sop sor sos soy spb spn spo spp spr sps spy sr- srb srn sro srp srr srs sry ss- ssb ssn sso ssp ssr sss sy- syb syn syp syr sys ybp ybr ybs yby ynn ynp yns yny yob yon yoo yop yor yos yoy ypo yps yrn yro yrp yrs ysb yso ysp ysr yss ysy yyb yys yyy