-er a-a aaa aad aae aam aar aax ad- ada add ade adm adr adx aea aed aee aem aer aex ama amd ame amm amr amx ar- ara ard are arm arr arx ax- axa axe axm axr axx daa dad dae dam dar dax dda ddd dde ddm ddr ddx de- dea ded dee dem der dex dma dmd dme dmm dmr dmx dra drd dre drm drr drx dxd dxr dxx eaa ead eae eam ear eax ed- eda edd ede edm edr edx eea eed eee eem eer eex em- ema emd eme emm emr emx era erd ere erm err ex- exa exd exe exr exx m-r maa mad mae mam mar max mda mdd mde mdm mdr mdx mea med mee mem mer mex mma mmd mme mmm mmr mmx mra mrd mre mrm mrr mrx mxa mxd mxr ra- raa rad rae ram rar rax rda rdd rde rdm rdr rdx re- rea red ree rem rer rex rma rmd rme rmm rmr rmx rra rrd rrm rrr rxr xaa xad xam xar xda xde xdm xdr xed xee xem xer xex xma xmd xmm xmr xmx xrd xrx xxx