b-p bbb bbk bbm bbo bbp bbr bbt bkb bkk bkm bko bkp bkr bkt bmb bmk bmm bmo bmp bmr bmt bob bok bom boo bop bor bot bpb bpm bpo bpp bpr bpt brb brk brm bro brp brr brt btb btk btm bto btp btr btt k-t kbb kbk kbm kbo kbp kbr kkb kkk kkm kkp kkr kkt kmb kmk kmm kmo kmp kmt kob kok kom koo kop kor kot kpk kpm kpo kpp kpr kpt krk kro krp krr krt ktb ktk ktm kto ktp ktr ktt m-o m-r mbb mbk mbm mbo mbp mbr mbt mkb mkk mkm mko mkp mkr mkt mmb mmk mmm mmo mmp mmr mmt mob mok mom moo mop mor mot mpb mpk mpm mpo mpp mpr mpt mrb mrk mrm mro mrp mrr mrt mtb mtk mtm mto mtp mtr mtt ob- obb obk obm obo obp obr obt okb okk oko okp okr om- omb omm omo omp omr omt oo- oob ook oom ooo oop oor oot op- opb opk opm opo opp opr opt or- orb ork orm oro orp orr ort ot- otb otk otm oto otp otr ott p-p pbb pbk pbm pbo pbp pbr pbt pkb pkm pko pkp pkr pkt pmb pmk pmm pmo pmp pmr pmt pob pok pom poo pop por pot ppb ppk ppm ppo ppp ppr ppt prb prk prm pro prp prr prt pt- ptb ptk ptm pto ptp ptr ptt rbb rbk rbm rbo rbp rbr rbt rkb rkk rkm rko rkp rkt rmb rmm rmo rmp rmr rmt rob rok rom roo rop ror rot rpb rpk rpm rpo rpp rpr rpt rrb rrk rrm rrp rrr rrt rtb rtk rtm rto rtp rtr rtt tbb tbk tbm tbo tbp tbr tbt tkb tkk tkm tko tkp tkr tkt tmb tmk tmm tmo tmp tmr tmt to- tob tok tom too top tor tot tpb tpk tpm tpo tpp tpr tpt trb trk trm tro trp trr trt ttb ttk ttm tto ttp ttr ttt