b-p bbb bbo bbp bbr bbs bby bob boo bop bor bos boy boz bpb bpo bpp bpr bps bpy brb bro brp brr brs bry brz bsb bso bsp bsr bss bsy by- byo byp byr bys byz bzo bzp bzr bzs bzz ob- obb obo obp obr obs oby oo- oob ooo oop oor oos op- opb opo opp opr ops opy or- orb oro orp orr ors ory orz os- osb oso osp osr oss oyo oys ozo ozs ozz p-p pbb pbo pbp pbr pbs pby pbz pob poo pop por pos poy poz ppb ppo ppp ppr pps ppz prb pro prp prr prs pry prz ps- psb pso psp psr pss psy py- pyb pyo pyr pys pzp rbb rbo rbp rbr rbs rob roo rop ror ros roy roz rpb rpo rpp rpr rps rpz rrb rrp rrr rrs rsb rso rsp rsr rss ry- ryo ryr rys ryy ryz rzb rzo rzy sbb sbo sbp sbr sbs sby sob soo sop sor sos soy soz spb spo spp spr sps spy spz sr- srb sro srp srr srs sry ss- ssb sso ssp ssr sss ssz sy- syb syp syr sys szp szr ybp ybr ybs yby ybz yob yoo yop yor yos yoy ypo yps yro yrp yrs ysb yso ysp ysr yss ysy ysz yyb yys yyy yyz yzb yzr yzy zbb zbr zbs zby zo- zob zoo zor zos zpo zpp zpr zro zrp zrs zsz zzr zzs zzy zzz