-er a-a a-c aaa aac aae aah aar ac- aca acc ace ach acr aea aec aee aeh aer aha ahc ahe ahh ahr ar- ara arc are arh arr c-- caa cac cae cah car cca ccc cce cch ccr ce- cea cec cee ceh cer ch- cha chc che chh chr cra crc cre crh crr eaa eac eae eah ear ec- eca ecc ece ech ecr eea eec eee eer eha ehc ehe ehh ehr era erc ere erh err haa hac hae hah har hca hcc hce hch hcr he- hea hec hee heh her hha hhc hhe hhh hhr hr- hra hrc hre hrh hrr ra- raa rac rae rah rar rca rcc rce rch rcr re- rea rec ree reh rer rh- rha rhc rhe rhh rhr rra rrc rrh rrr