b-p bbb bbn bbo bbp bbs bby bnb bnn bno bnp bns bob bon boo bop bos boy bpb bpn bpo bpp bps bpy bsb bsn bso bsp bss bsy by- byn byo byp bys nbb nbn nbo nbp nbs nnb nnn nno nnp nns no- nob non noo nop nos noy npb npn npo npp nps nsb nsn nso nsp nss nsy nyn nyo nyp nys nyy ob- obb obn obo obp obs oby on- onb onn ono onp ons ony oo- oob oon ooo oop oos op- opb opn opo opp ops opy os- osb osn oso osp oss oyo oys p-p pbb pbn pbo pbp pbs pby pn- pnb pnn pno pnp pns pny pob pon poo pop pos poy ppb ppn ppo ppp pps ps- psb psn pso psp pss psy py- pyb pyn pyo pys sbb sbn sbo sbp sbs sby snb snn sno snp sns sny sob son soo sop sos soy spb spn spo spp sps spy ss- ssb ssn sso ssp sss sy- syb syn syp sys ybp ybs yby ynn ynp yns yny yob yon yoo yop yos yoy ypo yps ysb yso ysp yss ysy yyb yys yyy