b-p bbb bbd bbo bbp bbr bbx bdb bdd bdo bdp bdr bdx bob bod boo bop bor box bpb bpd bpo bpp bpr bpx brb brd bro brp brr brx bxb bxd bxo bxx dbb dbd dbo dbp dbr dbx ddb ddd ddo ddp ddr ddx dob dod doo dop dor dox dpb dpd dpo dpp dpr drb drd dro drp drr drx dxd dxo dxp dxr dxx ob- obb obd obo obp obr obx odb odd odo odp odr oo- oob ood ooo oop oor oox op- opb opd opo opp opr opx or- orb ord oro orp orr orx ox- oxb oxo oxx p-p pbb pbd pbo pbp pbr pbx pdb pdd pdo pdp pdr pdx pob pod poo pop por pox ppb ppd ppo ppp ppr ppx prb prd pro prp prr prx pxr rbb rbd rbo rbp rbr rbx rdb rdd rdo rdp rdr rdx rob rod roo rop ror rox rpb rpd rpo rpp rpr rpx rrb rrd rrp rrr rxp rxr xbr xbx xdb xdr xod xoo xop xor xox xpb xpd xpo xpp xrd xrx xxo xxp xxx