b-p bbb bbo bbp bbr bbs bbt bob boo bop bor bos bot bov bpb bpo bpp bpr bps bpt bpv brb bro brp brr brs brt brv bsb bso bsp bsr bss bst bsv btb bto btp btr bts btt btv bvb bvo bvp bvr bvs bvt bvv ob- obb obo obp obr obs obt obv oo- oob ooo oop oor oos oot oov op- opb opo opp opr ops opt opv or- orb oro orp orr ors ort orv os- osb oso osp osr oss ost osv ot- otb oto otp otr ots ott otv ov- ovb ovo ovp ovs ovv p-p pbb pbo pbp pbr pbs pbt pob poo pop por pos pot pov ppb ppo ppp ppr pps ppt ppv prb pro prp prr prs prt prv ps- psb pso psp psr pss pst psv pt- ptb pto ptp ptr pts ptt ptv pvb pvo pvp pvr pvs pvt pvv rbb rbo rbp rbr rbs rbt rob roo rop ror ros rot rov rpb rpo rpp rpr rps rpt rpv rrb rrp rrr rrs rrt rsb rso rsp rsr rss rst rsv rtb rto rtp rtr rts rtt rtv rvb rvo rvp rvr rvs rvt rvv sbb sbo sbp sbr sbs sbt sbv sob soo sop sor sos sot sov spb spo spp spr sps spt spv sr- srb sro srp srr srs srt srv ss- ssb sso ssp ssr sss sst ssv stb sto stp str sts stt stv svb svo svp svr svs svt svv tbb tbo tbp tbr tbs tbt tbv to- tob too top tor tos tot tov tpb tpo tpp tpr tps tpt tpv trb tro trp trr trs trt trv tsb tso tsp tsr tss tst tsv ttb tto ttp ttr tts ttt ttv tvb tvo tvp tvr tvs tvt vbo vbr vbs vbv vob voo vop vor vos vot vov vpb vpo vpp vpr vps vpt vrb vrp vrr vrs vrt vsb vso vsp vsr vss vst vsv vtb vto vtr vts vtt vtv vvb vvo vvr vvs vvt vvv