-er a-a a-c aaa aac aad aae aam aar aas aax ac- aca acc acd ace acm acr acs acx ad- ada adc add ade adm adr ads adx aea aec aed aee aem aer aes aex ama amc amd ame amm amr ams amx ar- ara arc ard are arm arr ars arx as- asa asc asd ase asm asr ass asx ax- axa axe axm axr axs axx c-- caa cac cad cae cam car cas cax cca ccc ccd cce ccm ccr ccs ccx cda cdc cdd cde cdm cdr cds cdx ce- cea cec ced cee cem cer ces cex cma cmc cmd cme cmm cmr cms cmx cra crc crd cre crm crr crs crx csa csc csd cse csm csr css csx cxc cxr cxs cxx daa dac dad dae dam dar das dax dca dcc dcd dce dcm dcr dcs dcx dda ddc ddd dde ddm ddr dds ddx de- dea dec ded dee dem der des dex dma dmc dmd dme dmm dmr dms dmx dra drc drd dre drm drr drs drx dsa dsc dsd dse dsm dsr dss dsx dxc dxd dxr dxs dxx eaa eac ead eae eam ear eas eax ec- eca ecc ecd ece ecm ecr ecs ecx ed- eda edc edd ede edm edr eds edx eea eec eed eee eem eer ees eex em- ema emc emd eme emm emr ems emx era erc erd ere erm err ers es- esa esc esd ese esm esr ess esx ex- exa exc exd exe exr exs exx m-r maa mac mad mae mam mar mas max mc- mca mcc mcd mce mcm mcr mcs mcx mda mdc mdd mde mdm mdr mds mdx mea mec med mee mem mer mes mex mma mmc mmd mme mmm mmr mms mmx mra mrc mrd mre mrm mrr mrs mrx msa msc msd mse msm msr mss msx mxa mxc mxd mxr mxs ra- raa rac rad rae ram rar ras rax rca rcc rcd rce rcm rcr rcs rcx rda rdc rdd rde rdm rdr rds rdx re- rea rec red ree rem rer res rex rma rmc rmd rme rmm rmr rms rmx rra rrc rrd rrm rrr rrs rsa rsc rsd rse rsm rsr rss rsx rxr rxs saa sac sad sae sam sar sas sax sca scc scd sce scm scr scs scx sda sdc sdd sde sdm sdr sds se- sea sec sed see sem ser ses sex sma smc smd sme smm smr sms smx sr- sra src srd sre srm srr srs srx ss- ssa ssc ssd sse ssm ssr sss ssx sxc sxm sxs xaa xac xad xam xar xas xcd xcr xcx xda xdc xde xdm xdr xds xed xee xem xer xes xex xma xmc xmd xmm xmr xms xmx xrc xrd xrx xsa xsc xsm xss xxx