b-p bbb bbf bbm bbo bbp bbr bbs bfb bff bfm bfo bfp bfr bfs bmb bmf bmm bmo bmp bmr bms bob bof bom boo bop bor bos bpb bpf bpm bpo bpp bpr bps brb brf brm bro brp brr brs bsb bsf bsm bso bsp bsr bss fbb fbf fbm fbo fbp fbr fbs fff ffm ffo ffp ffr ffs fmb fmf fmm fmo fmp fmr fms fob fof fom foo fop for fos fpb fpm fpo fpp fpr fps frb frf frm fro frp frr frs fsb fsf fsm fso fsp fsr fss m-f m-o m-r mbb mbf mbm mbo mbp mbr mbs mfb mff mfm mfo mfp mfr mfs mmb mmf mmm mmo mmp mmr mms mob mof mom moo mop mor mos mpb mpf mpm mpo mpp mpr mps mrb mrf mrm mro mrp mrr mrs msb msf msm mso msp msr mss ob- obb obf obm obo obp obr obs of- ofb off ofm ofo ofp ofr ofs om- omb omf omm omo omp omr oms oo- oob oof oom ooo oop oor oos op- opb opf opm opo opp opr ops or- orb orf orm oro orp orr ors os- osb osf osm oso osp osr oss p-p pbb pbf pbm pbo pbp pbr pbs pfb pff pfm pfo pfp pfr pfs pmb pmf pmm pmo pmp pmr pms pob pof pom poo pop por pos ppb ppf ppm ppo ppp ppr pps prb prf prm pro prp prr prs ps- psb psf psm pso psp psr pss rbb rbf rbm rbo rbp rbr rbs rfb rff rfm rfo rfp rfr rfs rmb rmf rmm rmo rmp rmr rms rob rof rom roo rop ror ros rpb rpf rpm rpo rpp rpr rps rrb rrf rrm rrp rrr rrs rsb rsf rsm rso rsp rsr rss sbb sbf sbm sbo sbp sbr sbs sfb sff sfm sfo sfp sfr sfs smb smf smm smo smp smr sms sob sof som soo sop sor sos spb spf spm spo spp spr sps sr- srb srf srm sro srp srr srs ss- ssb ssf ssm sso ssp ssr sss