-er a-a a-c aaa aac aad aae aah aar ac- aca acc acd ace ach acr ad- ada adc add ade adh adr aea aec aed aee aeh aer aha ahc ahd ahe ahh ahr ar- ara arc ard are arh arr c-- caa cac cad cae cah car cca ccc ccd cce cch ccr cda cdc cdd cde cdh cdr ce- cea cec ced cee ceh cer ch- cha chc chd che chh chr cra crc crd cre crh crr daa dac dad dae dah dar dca dcc dcd dce dcr dda ddc ddd dde ddh ddr de- dea dec ded dee deh der dh- dha dhc dhd dhe dhh dhr dra drc drd dre drr eaa eac ead eae eah ear ec- eca ecc ecd ece ech ecr ed- eda edc edd ede edh edr eea eec eed eee eer eha ehc ehd ehe ehh ehr era erc erd ere erh err haa hac had hae hah har hca hcc hcd hce hch hcr hda hdc hdd hde hdh hdr he- hea hec hed hee heh her hha hhc hhd hhe hhh hhr hr- hra hrc hrd hre hrh hrr ra- raa rac rad rae rah rar rca rcc rcd rce rch rcr rda rdc rdd rde rdh rdr re- rea rec red ree reh rer rh- rha rhc rhd rhe rhh rhr rra rrc rrd rrh rrr