bbb bbd bbe bbm bbx bdb bdd bde bdm bdx be- beb bed bee bem bex bmb bmd bme bmm bmx bxb bxd bxm bxx dbb dbd dbe dbm dbx ddb ddd dde ddm ddx de- deb ded dee dem dex dmb dmd dme dmm dmx dxd dxx ebb ebd ebe ebm ebx ed- edb edd ede edm edx eeb eed eee eem eex em- emb emd eme emm emx ex- exd exe exx mbb mbd mbe mbm mbx mdb mdd mde mdm mdx meb med mee mem mex mmb mmd mme mmm mmx mxd xbe xbx xdb xde xdm xed xee xem xex xmd xmm xmx xxx