b-p bbb bbf bbm bbo bbp bbr bbt bfb bff bfm bfo bfp bfr bft bmb bmf bmm bmo bmp bmr bmt bob bof bom boo bop bor bot bpb bpf bpm bpo bpp bpr bpt brb brf brm bro brp brr brt btb btf btm bto btp btr btt fbb fbf fbm fbo fbp fbr fbt fff ffm ffo ffp ffr fft fmb fmf fmm fmo fmp fmr fmt fob fof fom foo fop for fot fpb fpm fpo fpp fpr fpt frb frf frm fro frp frr frt ftb ftf ftm fto ftp ftr ftt m-f m-o m-r mbb mbf mbm mbo mbp mbr mbt mfb mff mfm mfo mfp mfr mft mmb mmf mmm mmo mmp mmr mmt mob mof mom moo mop mor mot mpb mpf mpm mpo mpp mpr mpt mrb mrf mrm mro mrp mrr mrt mtb mtf mtm mto mtp mtr mtt ob- obb obf obm obo obp obr obt of- ofb off ofm ofo ofp ofr oft om- omb omf omm omo omp omr omt oo- oob oof oom ooo oop oor oot op- opb opf opm opo opp opr opt or- orb orf orm oro orp orr ort ot- otb otf otm oto otp otr ott p-p pbb pbf pbm pbo pbp pbr pbt pfb pff pfm pfo pfp pfr pft pmb pmf pmm pmo pmp pmr pmt pob pof pom poo pop por pot ppb ppf ppm ppo ppp ppr ppt prb prf prm pro prp prr prt pt- ptb ptf ptm pto ptp ptr ptt rbb rbf rbm rbo rbp rbr rbt rfb rff rfm rfo rfp rfr rft rmb rmf rmm rmo rmp rmr rmt rob rof rom roo rop ror rot rpb rpf rpm rpo rpp rpr rpt rrb rrf rrm rrp rrr rrt rtb rtf rtm rto rtp rtr rtt tbb tbf tbm tbo tbp tbr tbt tfb tff tfm tfo tfp tfr tft tmb tmf tmm tmo tmp tmr tmt to- tob tof tom too top tor tot tpb tpf tpm tpo tpp tpr tpt trb trf trm tro trp trr trt ttb ttf ttm tto ttp ttr ttt