b-p bbb bbi bbm bbo bbp bbr bbt bi- bib bii bim bio bip bir bit bmb bmi bmm bmo bmp bmr bmt bob boi bom boo bop bor bot bpb bpi bpm bpo bpp bpr bpt brb bri brm bro brp brr brt btb bti btm bto btp btr btt ibb ibi ibm ibo ibp ibr ibt iib iii iim iio iip iir iit im- imb imi imm imo imp imt io- iob ioi iom ioo iop ior iot ipb ipi ipm ipo ipp ipr ipt ir- irb iri irm iro irp irr irt itb iti itm ito itp itt m-o m-r mbb mbi mbm mbo mbp mbr mbt mi- mib mii mim mio mip mir mit mmb mmi mmm mmo mmp mmr mmt mob moi mom moo mop mor mot mpb mpi mpm mpo mpp mpr mpt mrb mri mrm mro mrp mrr mrt mtb mti mtm mto mtp mtr mtt o-i ob- obb obi obm obo obp obr obt oib oii oim oio oip oir oit om- omb omi omm omo omp omr omt oo- oob ooi oom ooo oop oor oot op- opb opi opm opo opp opr opt or- orb ori orm oro orp orr ort ot- otb oti otm oto otp otr ott p-p pbb pbi pbm pbo pbp pbr pbt pib pii pim pio pip pir pit pmb pmi pmm pmo pmp pmr pmt pob poi pom poo pop por pot ppb ppi ppm ppo ppp ppr ppt prb pri prm pro prp prr prt pt- ptb pti ptm pto ptp ptr ptt rbb rbi rbm rbo rbp rbr rbt rib rii rim rio rip rir rit rmb rmi rmm rmo rmp rmr rmt rob roi rom roo rop ror rot rpb rpi rpm rpo rpp rpr rpt rrb rri rrm rrp rrr rrt rtb rti rtm rto rtp rtr rtt tbb tbi tbm tbo tbp tbr tbt tib tii tim tio tip tir tit tmb tmi tmm tmo tmp tmr tmt to- tob toi tom too top tor tot tpb tpi tpm tpo tpp tpr tpt trb tri trm tro trp trr trt ttb tti ttm tto ttp ttr ttt