bbb bbk bbm bbo bbr bbt bkb bkk bkm bko bkr bkt bmb bmk bmm bmo bmr bmt bob bok bom boo bor bot brb brk brm bro brr brt btb btk btm bto btr btt k-t kbb kbk kbm kbo kbr kkb kkk kkm kkr kkt kmb kmk kmm kmo kmt kob kok kom koo kor kot krk kro krr krt ktb ktk ktm kto ktr ktt m-o m-r mbb mbk mbm mbo mbr mbt mkb mkk mkm mko mkr mkt mmb mmk mmm mmo mmr mmt mob mok mom moo mor mot mrb mrk mrm mro mrr mrt mtb mtk mtm mto mtr mtt ob- obb obk obm obo obr obt okb okk oko okr om- omb omm omo omr omt oo- oob ook oom ooo oor oot or- orb ork orm oro orr ort ot- otb otk otm oto otr ott rbb rbk rbm rbo rbr rbt rkb rkk rkm rko rkt rmb rmm rmo rmr rmt rob rok rom roo ror rot rrb rrk rrm rrr rrt rtb rtk rtm rto rtr rtt tbb tbk tbm tbo tbr tbt tkb tkk tkm tko tkr tkt tmb tmk tmm tmo tmr tmt to- tob tok tom too tor tot trb trk trm tro trr trt ttb ttk ttm tto ttr ttt