b-p bbb bbd bbk bbo bbp bbr bdb bdd bdk bdo bdp bdr bkb bkk bko bkp bkr bob bod bok boo bop bor bpb bpd bpo bpp bpr brb brd brk bro brp brr dbb dbd dbk dbo dbp dbr ddb ddd ddk ddo ddp ddr dkb dkk dko dkp dkr dob dod dok doo dop dor dpb dpd dpk dpo dpp dpr drb drd drk dro drp drr kbb kbd kbk kbo kbp kbr kdb kdk kdo kdp kdr kkb kkk kkp kkr kob kod kok koo kop kor kpd kpk kpo kpp kpr krd krk kro krp krr ob- obb obd obk obo obp obr odb odd odo odp odr okb okd okk oko okp okr oo- oob ood ook ooo oop oor op- opb opd opk opo opp opr or- orb ord ork oro orp orr p-p pbb pbd pbk pbo pbp pbr pdb pdd pdk pdo pdp pdr pkb pkd pko pkp pkr pob pod pok poo pop por ppb ppd ppk ppo ppp ppr prb prd prk pro prp prr rbb rbd rbk rbo rbp rbr rdb rdd rdo rdp rdr rkb rkk rko rkp rob rod rok roo rop ror rpb rpd rpk rpo rpp rpr rrb rrd rrk rrp rrr