-er bbb bbd bbe bbf bbm bbo bbr bbx bdb bdd bde bdf bdm bdo bdr bdx be- beb bed bee bef bem beo ber bex bfb bfd bfe bff bfm bfo bfr bfx bmb bmd bme bmf bmm bmo bmr bmx bob bod boe bof bom boo bor box brb brd bre brf brm bro brr brx bxb bxd bxm bxo bxx dbb dbd dbe dbf dbm dbo dbr dbx ddb ddd dde ddf ddm ddo ddr ddx de- deb ded dee def dem deo der dex dfb dfd dfe dff dfm dfo dfr dfx dmb dmd dme dmf dmm dmo dmr dmx dob dod doe dof dom doo dor dox drb drd dre drm dro drr drx dxd dxo dxr dxx ebb ebd ebe ebf ebm ebo ebr ebx ed- edb edd ede edf edm edo edr edx eeb eed eee eef eem eeo eer eex ef- efb efd efe eff efm efo efr efx em- emb emd eme emf emm emo emr emx eo- eob eod eoe eof eom eoo eor erb erd ere erf erm ero err ex- exd exe exo exr exx fbb fbd fbe fbf fbm fbo fbr fbx fdb fdd fde fdf fdm fdo fdr fdx feb fed fee fef fem feo fer fex ffd ffe fff ffm ffo ffr ffx fmb fmd fme fmf fmm fmo fmr fmx fob foe fof fom foo for fox frb frd fre frf frm fro frr fxe fxm fxr fxx m-f m-o m-r mbb mbd mbe mbf mbm mbo mbr mbx mdb mdd mde mdf mdm mdo mdr mdx meb med mee mef mem meo mer mex mfb mfd mfe mff mfm mfo mfr mmb mmd mme mmf mmm mmo mmr mmx mob mod moe mof mom moo mor mox mrb mrd mre mrf mrm mro mrr mrx mxd mxr ob- obb obd obe obf obm obo obr obx odb odd ode odf odm odo odr oeb oed oee oef oem oeo oer oex of- ofb ofd ofe off ofm ofo ofr ofx om- omb omd ome omf omm omo omr omx oo- oob ood oof oom ooo oor oox or- orb ord ore orf orm oro orr orx ox- oxb oxf oxo oxx rbb rbd rbe rbf rbm rbo rbr rbx rdb rdd rde rdf rdm rdo rdr rdx re- reb red ree ref rem reo rer rex rfb rfd rfe rff rfm rfo rfr rmb rmd rme rmf rmm rmo rmr rmx rob rod roe rof rom roo ror rox rrb rrd rrf rrm rrr rxr xbe xbr xbx xdb xde xdf xdm xdr xed xee xem xer xex xfe xfm xfx xmd xmf xmm xmo xmr xmx xod xof xom xoo xor xox xrd xrf xrx xxo xxx