-er bbb bbe bbm bbo bbr bbx be- beb bee bem beo ber bev bex bmb bme bmm bmo bmr bmv bmx bob boe bom boo bor bov box brb bre brm bro brr brv brx bvb bve bvm bvo bvr bvv bxb bxm bxo bxx ebb ebe ebm ebo ebr ebv ebx eeb eee eem eeo eer eev eex em- emb eme emm emo emr emv emx eo- eob eoe eom eoo eor erb ere erm ero err erv evb eve evm evo evr evv ex- exe exo exr exx m-o m-r m-v mbb mbe mbm mbo mbr mbv mbx meb mee mem meo mer mev mex mmb mme mmm mmo mmr mmv mmx mob moe mom moo mor mov mox mrb mre mrm mro mrr mrv mrx mvb mve mvm mvo mvr mvv mxr ob- obb obe obm obo obr obv obx oeb oee oem oeo oer oex om- omb ome omm omo omr omv omx oo- oob oom ooo oor oov oox or- orb ore orm oro orr orv orx ov- ovb ove ovo ovv ox- oxb oxo oxx rbb rbe rbm rbo rbr rbx re- reb ree rem reo rer rev rex rmb rme rmm rmo rmr rmv rmx rob roe rom roo ror rov rox rrb rrm rrr rvb rve rvm rvo rvr rvv rxr v-e vbm vbo vbr vbv veb vee vem veo ver vex vm- vmm vmo vmr vmx vob voe vom voo vor vov vox vrb vre vrm vrr vvb vvm vvo vvr vvv vxr vxv xbe xbr xbx xee xem xer xev xex xmm xmo xmr xmx xom xoo xor xov xox xrx xxo xxv xxx