bbb bbd bbe bbm bbn bbx bdb bdd bde bdm bdx be- beb bed bee bem ben bex bmb bmd bme bmm bmn bmx bnb bnd bne bnn bnx bxb bxd bxm bxn bxx dbb dbd dbe dbm dbn dbx ddb ddd dde ddm ddn ddx de- deb ded dee dem den dex dmb dmd dme dmm dmn dmx dnb dnd dne dnm dnn dxd dxn dxx ebb ebd ebe ebm ebn ebx ed- edb edd ede edm edn edx eeb eed eee eem een eex em- emb emd eme emm emn emx en- enb end ene enm enn ex- exd exe exx mbb mbd mbe mbm mbx mdb mdd mde mdm mdn mdx meb med mee mem men mex mmb mmd mme mmm mmn mmx mnb mne mnm mnn mxd mxn nbb nbd nbe nbm nbn nbx ndb ndd nde ndm ndn ne- neb ned nee nem nen nex nmb nmd nme nmm nmn nnb nne nnm nnn nxd xbe xbx xdb xde xdm xed xee xem xen xex xmd xmm xmx xxx