b-p bbb bbf bbm bbo bbp bfb bff bfm bfo bfp bmb bmf bmm bmo bmp bob bof bom boo bop bpb bpf bpm bpo bpp fbb fbf fbm fbo fbp fff ffm ffo ffp fmb fmf fmm fmo fmp fob fof fom foo fop fpb fpm fpo fpp m-f m-o mbb mbf mbm mbo mbp mfb mff mfm mfo mfp mmb mmf mmm mmo mmp mob mof mom moo mop mpb mpf mpm mpo mpp ob- obb obf obm obo obp of- ofb off ofm ofo ofp om- omb omf omm omo omp oo- oob oof oom ooo oop op- opb opf opm opo opp p-p pbb pbf pbm pbo pbp pfb pff pfm pfo pfp pmb pmf pmm pmo pmp pob pof pom poo pop ppb ppf ppm ppo ppp