-er bbb bbe bbg bbm bbo bbr bbx be- beb bee beg bem beo ber bex bgb bge bgg bgm bgo bgr bgx bmb bme bmg bmm bmo bmr bmx bob boe bog bom boo bor box brb bre brg brm bro brr brx bxb bxm bxo bxx ebb ebe ebg ebm ebo ebr ebx eeb eee eeg eem eeo eer eex egb ege egg egm ego egr egx em- emb eme emg emm emo emr emx eo- eob eoe eog eom eoo eor erb ere erg erm ero err ex- exe exo exr exx gbe gbg gbm gbo gbr gbx ge- geb gee geg gem geo ger gex ggb ggg ggm ggo ggr gmb gme gmg gmm gmo gmr gmx gob goe gog gom goo gor gox grb gre grg grm gro grr grx m-o m-r mbb mbe mbg mbm mbo mbr mbx meb mee meg mem meo mer mex mgb mge mgm mgo mgr mgx mmb mme mmg mmm mmo mmr mmx mob moe mog mom moo mor mox mrb mre mrg mrm mro mrr mrx mxr ob- obb obe obg obm obo obr obx oeb oee oeg oem oeo oer oex oge ogg ogo ogx om- omb ome omg omm omo omr omx oo- oob oog oom ooo oor oox or- orb ore org orm oro orr orx ox- oxb oxo oxx rbb rbe rbg rbm rbo rbr rbx re- reb ree reg rem reo rer rex rgb rge rgg rgo rgr rgx rmb rme rmg rmm rmo rmr rmx rob roe rog rom roo ror rox rrb rrg rrm rrr rxr xbe xbr xbx xee xeg xem xer xex xge xmg xmm xmo xmr xmx xog xom xoo xor xox xrx xxo xxx