-er bbb bbd bbe bbm bbr bbt bbx bdb bdd bde bdm bdr bdt bdx be- beb bed bee bem ber bet bex bmb bmd bme bmm bmr bmt bmx brb brd bre brm brr brt brx btb btd bte btm btr btt btx bxb bxd bxm bxx dbb dbd dbe dbm dbr dbt dbx ddb ddd dde ddm ddr ddt ddx de- deb ded dee dem der det dex dmb dmd dme dmm dmr dmt dmx drb drd dre drm drr drt drx dtb dtd dte dtm dtr dtt dtx dxd dxr dxt dxx ebb ebd ebe ebm ebr ebt ebx ed- edb edd ede edm edr edt edx eeb eed eee eem eer eet eex em- emb emd eme emm emr emt emx erb erd ere erm err ert etb etd ete etm etr ett etx ex- exd exe exr ext exx m-r mbb mbd mbe mbm mbr mbt mbx mdb mdd mde mdm mdr mdt mdx meb med mee mem mer met mex mmb mmd mme mmm mmr mmt mmx mrb mrd mre mrm mrr mrt mrx mtb mtd mte mtm mtr mtt mtx mxd mxr rbb rbd rbe rbm rbr rbt rbx rdb rdd rde rdm rdr rdt rdx re- reb red ree rem rer ret rex rmb rmd rme rmm rmr rmt rmx rrb rrd rrm rrr rrt rtb rtd rte rtm rtr rtt rtx rxr t-x tbb tbd tbe tbm tbr tbt tdb tdd tde tdm tdr tdt tdx te- teb ted tee tem ter tet tex tmb tmd tme tmm tmr tmt tmx trb trd tre trm trr trt trx ttb ttd tte ttm ttr ttt ttx txe txt xbe xbr xbx xdb xde xdm xdr xdt xed xee xem xer xet xex xmd xmm xmr xmt xmx xrd xrt xrx xtm xtr xtx xxx