b-p bbb bbd bbk bbo bbp bbr bbs bdb bdd bdk bdo bdp bdr bds bkb bkk bko bkp bkr bks bob bod bok boo bop bor bos bpb bpd bpo bpp bpr bps brb brd brk bro brp brr brs bsb bsd bsk bso bsp bsr bss dbb dbd dbk dbo dbp dbr dbs ddb ddd ddk ddo ddp ddr dds dkb dkk dko dkp dkr dks dob dod dok doo dop dor dos dpb dpd dpk dpo dpp dpr dps drb drd drk dro drp drr drs dsb dsd dsk dso dsp dsr dss kbb kbd kbk kbo kbp kbr kbs kdb kdk kdo kdp kdr kds kkb kkk kkp kkr kks kob kod kok koo kop kor kos kpd kpk kpo kpp kpr kps krd krk kro krp krr krs ksb ksd ksk kso ksp ksr kss ob- obb obd obk obo obp obr obs odb odd odo odp odr ods okb okd okk oko okp okr oks oo- oob ood ook ooo oop oor oos op- opb opd opk opo opp opr ops or- orb ord ork oro orp orr ors os- osb osd osk oso osp osr oss p-p pbb pbd pbk pbo pbp pbr pbs pdb pdd pdk pdo pdp pdr pds pkb pkd pko pkp pkr pks pob pod pok poo pop por pos ppb ppd ppk ppo ppp ppr pps prb prd prk pro prp prr prs ps- psb psd psk pso psp psr pss rbb rbd rbk rbo rbp rbr rbs rdb rdd rdo rdp rdr rds rkb rkk rko rkp rks rob rod rok roo rop ror ros rpb rpd rpk rpo rpp rpr rps rrb rrd rrk rrp rrr rrs rsb rsd rsk rso rsp rsr rss sbb sbd sbk sbo sbp sbr sbs sdb sdd sdk sdo sdp sdr sds sk- skb skd skk sko skp skr sks sob sod sok soo sop sor sos spb spd spk spo spp spr sps sr- srb srd srk sro srp srr srs ss- ssb ssd ssk sso ssp ssr sss