-ol bbb bbl bbm bbo bbr bbt blb bll blm blo blr blt bmb bml bmm bmo bmr bmt bob bol bom boo bor bot brb brl brm bro brr brt btb btl btm bto btr btt lbb lbl lbm lbo lbr lbt llb lll llm llo llr llt lmb lml lmm lmo lmr lmt lob lol lom loo lor lot lrb lrm lro lrr lrt ltb ltl ltm lto ltr ltt m-o m-r mbb mbl mbm mbo mbr mbt mlb mll mlm mlo mlr mlt mmb mml mmm mmo mmr mmt mob mol mom moo mor mot mrb mrl mrm mro mrr mrt mtb mtl mtm mto mtr mtt ob- obb obl obm obo obr obt olb oll olm olo olt om- omb oml omm omo omr omt oo- oob ool oom ooo oor oot or- orb orl orm oro orr ort ot- otb otl otm oto otr ott rbb rbl rbm rbo rbr rbt rll rlm rlo rlr rlt rmb rml rmm rmo rmr rmt rob rol rom roo ror rot rrb rrl rrm rrr rrt rtb rtl rtm rto rtr rtt tbb tbl tbm tbo tbr tbt tll tlm tlo tlr tlt tmb tml tmm tmo tmr tmt to- tob tol tom too tor tot trb trl trm tro trr trt ttb ttl ttm tto ttr ttt