b-p bbb bbm bbo bbp bbr bbt bmb bmm bmo bmp bmr bmt bob bom boo bop bor bot bpb bpm bpo bpp bpr bpt brb brm bro brp brr brt btb btm bto btp btr btt m-o m-r mbb mbm mbo mbp mbr mbt mmb mmm mmo mmp mmr mmt mob mom moo mop mor mot mpb mpm mpo mpp mpr mpt mrb mrm mro mrp mrr mrt mtb mtm mto mtp mtr mtt ob- obb obm obo obp obr obt om- omb omm omo omp omr omt oo- oob oom ooo oop oor oot op- opb opm opo opp opr opt or- orb orm oro orp orr ort ot- otb otm oto otp otr ott p-p pbb pbm pbo pbp pbr pbt pmb pmm pmo pmp pmr pmt pob pom poo pop por pot ppb ppm ppo ppp ppr ppt prb prm pro prp prr prt pt- ptb ptm pto ptp ptr ptt rbb rbm rbo rbp rbr rbt rmb rmm rmo rmp rmr rmt rob rom roo rop ror rot rpb rpm rpo rpp rpr rpt rrb rrm rrp rrr rrt rtb rtm rto rtp rtr rtt tbb tbm tbo tbp tbr tbt tmb tmm tmo tmp tmr tmt to- tob tom too top tor tot tpb tpm tpo tpp tpr tpt trb trm tro trp trr trt ttb ttm tto ttp ttr ttt