a-a a-b aaa aab aad aam aax ab- aba abb abd abm abx ad- ada adb add adm adx ama amb amd amm amx ax- axa axm axx baa bab bad bam bax bba bbb bbd bbm bbx bda bdb bdd bdm bdx bma bmb bmd bmm bmx bxb bxd bxm bxx daa dab dad dam dax dba dbb dbd dbm dbx dda ddb ddd ddm ddx dma dmb dmd dmm dmx dxd dxx maa mab mad mam max mba mbb mbd mbm mbx mda mdb mdd mdm mdx mma mmb mmd mmm mmx mxa mxd xaa xad xam xbx xda xdb xdm xma xmd xmm xmx xxx