-er a-a a-c aaa aac aad aae aam aar ac- aca acc acd ace acm acr ad- ada adc add ade adm adr aea aec aed aee aem aer ama amc amd ame amm amr ar- ara arc ard are arm arr c-- caa cac cad cae cam car cca ccc ccd cce ccm ccr cda cdc cdd cde cdm cdr ce- cea cec ced cee cem cer cma cmc cmd cme cmm cmr cra crc crd cre crm crr daa dac dad dae dam dar dca dcc dcd dce dcm dcr dda ddc ddd dde ddm ddr de- dea dec ded dee dem der dma dmc dmd dme dmm dmr dra drc drd dre drm drr eaa eac ead eae eam ear ec- eca ecc ecd ece ecm ecr ed- eda edc edd ede edm edr eea eec eed eee eem eer em- ema emc emd eme emm emr era erc erd ere erm err m-r maa mac mad mae mam mar mc- mca mcc mcd mce mcm mcr mda mdc mdd mde mdm mdr mea mec med mee mem mer mma mmc mmd mme mmm mmr mra mrc mrd mre mrm mrr ra- raa rac rad rae ram rar rca rcc rcd rce rcm rcr rda rdc rdd rde rdm rdr re- rea rec red ree rem rer rma rmc rmd rme rmm rmr rra rrc rrd rrm rrr