-er a-a a-c aaa aac aad aae aam aar aax ac- aca acc acd ace acm acr acx ad- ada adc add ade adm adr adx aea aec aed aee aem aer aex ama amc amd ame amm amr amx ar- ara arc ard are arm arr arx ax- axa axe axm axr axx c-- caa cac cad cae cam car cax cca ccc ccd cce ccm ccr ccx cda cdc cdd cde cdm cdr cdx ce- cea cec ced cee cem cer cex cma cmc cmd cme cmm cmr cmx cra crc crd cre crm crr crx cxc cxr cxx daa dac dad dae dam dar dax dca dcc dcd dce dcm dcr dcx dda ddc ddd dde ddm ddr ddx de- dea dec ded dee dem der dex dma dmc dmd dme dmm dmr dmx dra drc drd dre drm drr drx dxc dxd dxr dxx eaa eac ead eae eam ear eax ec- eca ecc ecd ece ecm ecr ecx ed- eda edc edd ede edm edr edx eea eec eed eee eem eer eex em- ema emc emd eme emm emr emx era erc erd ere erm err ex- exa exc exd exe exr exx m-r maa mac mad mae mam mar max mc- mca mcc mcd mce mcm mcr mcx mda mdc mdd mde mdm mdr mdx mea mec med mee mem mer mex mma mmc mmd mme mmm mmr mmx mra mrc mrd mre mrm mrr mrx mxa mxc mxd mxr ra- raa rac rad rae ram rar rax rca rcc rcd rce rcm rcr rcx rda rdc rdd rde rdm rdr rdx re- rea rec red ree rem rer rex rma rmc rmd rme rmm rmr rmx rra rrc rrd rrm rrr rxr xaa xac xad xam xar xcd xcr xcx xda xdc xde xdm xdr xed xee xem xer xex xma xmc xmd xmm xmr xmx xrc xrd xrx xxx