-er bbb bbd bbe bbi bbm bbr bbx bdb bdd bde bdi bdm bdr bdx be- beb bed bee bei bem ber bex bi- bib bid bie bii bim bir bix bmb bmd bme bmi bmm bmr bmx brb brd bre bri brm brr brx bxb bxd bxi bxm bxx dbb dbd dbe dbi dbm dbr dbx ddb ddd dde ddi ddm ddr ddx de- deb ded dee dei dem der dex di- dib did die dii dim dir dix dmb dmd dme dmi dmm dmr dmx drb drd dre dri drm drr drx dxd dxi dxr dxx ebb ebd ebe ebi ebm ebr ebx ed- edb edd ede edi edm edr edx eeb eed eee eem eer eex eib eid eie eii eim eir eix em- emb emd eme emi emm emr emx erb erd ere eri erm err ex- exd exe exi exr exx i-d ibb ibd ibe ibi ibm ibr ibx idb idd ide idi idm idr idx ie- ied iee iei iem ier iex iib iid iie iii iim iir iix im- imb imd ime imi imm imx ir- irb ird ire iri irm irr irx ixe ixi m-r mbb mbd mbe mbi mbm mbr mbx mdb mdd mde mdi mdm mdr mdx meb med mee mei mem mer mex mi- mib mid mie mii mim mir mix mmb mmd mme mmi mmm mmr mmx mrb mrd mre mri mrm mrr mrx mxd mxi mxr rbb rbd rbe rbi rbm rbr rbx rdb rdd rde rdi rdm rdr rdx re- reb red ree rei rem rer rex rib rid rie rii rim rir rix rmb rmd rme rmi rmm rmr rmx rrb rrd rri rrm rrr rxr xbe xbr xbx xdb xde xdi xdm xdr xed xee xem xer xex xie xii xix xmd xmi xmm xmr xmx xrd xrx xxi xxx