a-a a-b aaa aab aad aam aan aax ab- aba abb abd abm abn abx ad- ada adb add adm adn adx ama amb amd amm amn amx an- ana anb and anm ann anx ax- axa axm axn axx baa bab bad bam ban bax bba bbb bbd bbm bbn bbx bda bdb bdd bdm bdx bma bmb bmd bmm bmn bmx bna bnb bnd bnn bnx bxb bxd bxm bxn bxx daa dab dad dam dan dax dba dbb dbd dbm dbn dbx dda ddb ddd ddm ddn ddx dma dmb dmd dmm dmn dmx dna dnb dnd dnm dnn dxd dxn dxx maa mab mad mam man max mba mbb mbd mbm mbx mda mdb mdd mdm mdn mdx mma mmb mmd mmm mmn mmx mna mnb mnm mnn mxa mxd mxn naa nab nad nam nan nax nba nbb nbd nbm nbn nbx nda ndb ndd ndm ndn nma nmb nmd nmm nmn nna nnb nnm nnn nxd xaa xad xam xan xbx xda xdb xdm xma xmd xmm xmx xna xxx